Friend of mine thought he was buying three normal green bell pepper plants. However, two of them turned out to be this:

They are sweet and really quite tasty, but I've never seen a red and purple striped sweet pepper like this before. Not a fluke either, as all of the pods were doing this to one degree or another on both plants. All of them were vertical stripes.

I grabbed one of the ripe pods and seeded it as I think I'm going to make this my go-to sweet pepper from growing now on. Tastes great, visually distinctive, but what the heck is it?