Here's another one. Not really "ridiculous," but it still confuses me.
Back in my super rebellious teenage days, I got my ear pierced. It lasted for about a month before I decided I hated it, so I took it out. The hole got infected. Okay, fine, no big deal. Shit heals.
Except that it never did. I haven't had an earring in there in roughly 14 years, and the hole is still open, and it still occasionally gets inflamed. You'd think it would have healed by now, right?