People Describe Things Their Friends And Family Thought Were Perfectly Normal - But Aren't

List Rules
Vote up the most ridiculous things you can't believe people thought were normal.

People learn strange things about their friends, family members, and coworkers all the time. And oftentimes, loved lones and associates think their strange behaviors are normal. In fact, they may not learn pooping in the shower is generally taboo until someone lets them know. 

Redditors, of course, have multiple stories about these abnormal habits. They could hardly make these things up.