You can’t hide your weird from your housemate.
All their weird food habits.
Everyone has weird food habits, and some people think totally normal habits like sprinkling sugar on your peanut butter and toast is weird.
Everything about their sex life.
If you don't actually hear them doing it, you'll have the awkward greeting with whomever they were doing it with the next morning.
And what they really watch on Netflix.
They might say they're "really into independent cinema" on their Tinder profile, but you know they just binge-watch MasterChef when they get home from work.