Shared Toothbrushes
Dude, I caught an old roommate using my toothbrush once. I was all like, “WHAT ON EARTH DO YOU THINK YOU’RE DOING, DUDE?!” But he was baffled as to why I was disgusted.
Apparently he’d been doing it for awhile. He thought it was normal for people who lived together to just share toothbrushes for some reason.
Story credit: Reddit / NintendoDestroyer89