Yes, it is a grub worm....

You are finding these INside your home? Can anyone think of why grubs would be found inside? It's a mystery to me.

Yes, INSIDE my house! I saw one this afternoon outside my back door - about as big as my index finger. Yuck!
We have had very little rain this year and I'm wondering if that is why they are coming up out of the ground? But, I can't figure out why or, how they are getting IN my house. I live in a 100 year old farm house and the back of the house is nearly on the ground. I was also lazy about keeping the weeds away from my house this year. Maybe there is a connection? I talked to two experts today and they were baffled too about them being IN the house. Any ideas?

Do you have pets that could have brought them in? (carried on the legs)

No, they are coming in on their own.

Hmmmmm....you know many of the grubs around here have surfaced (most likely due to drought)....wonder if they simply crawled in ....

THis is fascinating...I was just ready to post that periods of flooding will bring them up when I read that you are in the same boat we are....drought.
One question: is there any dead, decaying wood such as an old stump or a tree nearby? While some grubs live in the ground, others do their thing in rotting wood. This might be a possible source, although I still can't offer anything other than guesses as to why they would be leaving their logs and entering a house.
Anyone else....?

Uh oh...maybe I have some rotting wood under my house! As I mentioned earlier, my home is 100 years old and the back is nearly on the ground. But, unles I have a water leak somewhere - and all the plumbing is in the rear of the house where I've seen these things - I can't imaging there being much moisture under the house since we are in the middle of a draught.
Good news: I haven't seen any more in 3-4 days...about the time I got rid of the big bag of sunflower seeds. Could be a coincidence, or not.

Yep, they could have come from the bag of seeds. I had guinee pig food get wet once and I didn't know about it and it got those grubs.

I found 3 more right after my last post. sigh. I think I may need to hire a plumber to check for leaks.
More good news, though! We had a good rain all night long so, maybe now they will leave the house.

I only know of the wood-boring types from dead natural wood, such as trees...I could be wrong but I don't think they go after cut, treated lumber. Before you invest in an exterminator, which I really don't think is necessary in this case, try your level best to find out which beetle this is from. Grub worms aren't true worms at all but simply a developmental stage of beetles. If you have a college or university nearby, or even a county extension office, there might be a local entymologist that can do an ID for you. Once you know what beetle this is you can determine if it is truly a problem or not and if you need to take any action.
I have had pests hatch from seed before as well, and usually it is either a small moth of some sort or, less often, a smallish beetle. A grub the size of your pinkie is going to become a much larger beetle than the ones that are the usual hitchikers in sunflower seed. I hate to use the word NEVER in anything pertaining to nature, but I am willing to bet that your grubs are coming from an outside source.
Any mulch beds/leaf piles/compost just outside the door? I suggest you do a little bit of shallow digging around close to the nearest door. These can provide living quarters for grubs, as well as good old turf. And before you do any of that, look closely for neat little round holes in the ground, the size of your fat little wrigglers. If there's something driving them out of their burrows there will be an opening.
Another thought...has anyone applied any fall fertilize/weed-n-feed type stuff to your lawn? Some of those are formulated with built-in pesticides to control grubs. My mother-in-law applied some nasty stuff to her yard once (forget about living in harmony with other creatures over there...)and within a day or two the yard was LITTERED with dead and dying grubs and worms and all kinds of things. They left their places in the soil in an attempt to flee the poison but it wan't going to help.

Can you give us a better description of the grub?

Thanks, All, for the help.
No, no chemicals have been used in the yard. I had some overgrown grass/weeds near the back porch and I pulled them away on Sunday...didn't see any grubs on the surface. I don't know how to describe them any better - they're ugly, disgusting to look at and about the size of my pinky finger. I looked for pictures on google and found some similar but not exactly like these. I'll have nightmaers if I look at any more grub pictures! Lol

Okay, I looked one last time and I think this mystery is solved! It looks like the June beetle larve and the web site had this to say, 'HABITAT AND HABITS
Grubs feed on the roots of grasses and some crops, and are usually found in the soil of agricultural and weedy areas. The adults feed at night on the foliage of various trees and bushes. Because adults are so strongly attracted to lights, they often turn up in numbers at streetlights and porch lights. They may be easy to spot along trails in sandy areas during the day, when they are often very lethargic. '

Guess what? I leave a light on inside my back porch at night and about two weeks ago it burned out and the one I put in is much brighter than it needs to be. I'm going to replace it RIGHT NOW. Lol I'll let you know if that gets rid of them.
Here is the web site: http://www.royalalbertamuseum.ca/natural/insects/bugsfaq/junebeet.htm

That might help but I really don't know...the larvae are subterranean feeders and I think the attraction to lights mainly applies to the adults but it's a simple thing to try anyway.
I also see that you are in Tennessee...I don't know how late in the year you folks still have insects around, but up here in Illinois most things are through with their cycles and either dying or searching out a favorable spot to overwinter. Grubs should be tunneling in to avoid the approaching cold, not emerging.
I'm suspecting something, possibly connected to the drought, is driving them out.
Were you lucky enough to get any of the rains here lately?

I am 'grubless' - none last night and none today. Yippie! I removed the 75 watt and put in a 40 and didn't turn it on last night.
This has been a very weird year weather-wise. I picked some blooming honeysuckle this morning and my mom's roses and butterfly bushes are blooming full force. Our hollies at the nursery I work for are putting out new growth. Today it was about 65 degrees and cloudy but, we didn't get more than an inch of rain from the big system that moved through the east yesterday. The ground is very dry - less than 3" of moisture in depth.

I have them in my house too! We have a new house and I find them on the hardwoods all the time. They're disgusting = I had no idea what they were at first. Why are they in my house and will they cause a problem? How do I get rid of them?