The 8ft fluorescent light in the barn tack room failed recently. The problem seemed to be in the ballast, since the fixture was getting electric new bulbs didn't help. Lowe's had a transformer that seemed like the right configuration, but it was only rated for %0 deg F minimum, and it might not have been rated for enough current.

So instead I decided to install 5 cheap ceramic incandescent fixtures and use LED bulbs in them. I installed 5 new octagonal junction boxes, ran the wire to each box, and then had to make one more run to the hardware store. The ceramic fixtures had no ground screw, and the junction boxes didn't come with ground screws either. I thought maybe for a second about finishing wiring them up and at some point getting grounding screws, but knowing myself at some point translates to never.

So I got grounding screws, attached the ground wires to the junction boxes, finished connecting the ceramic fixtures, installed the LED bulbs, made sure the switch was off, and then flipped the breaker on. I then went to the switch, smiled to myself at a job well done, and flipped the switch on and heard the breaker go >click<. Upon checking the wiring in the first box where the power and the switch leg come in, and the wire for the rest of the lights exits, everything seemed fine there, but the resistance between switched hot, and ground was approx 0 ohms. At the next box over I found that the hot wire was pinched between the ceramic bulb holder and the junction box enough to make contact.

Had I gone with the original, good-enough-for-now plan, the box would have been live waiting to shock someone whenever the light was on.