8. Urination is not funny.
When it comes to off-color banter, women can probably cross the line of appropriateness faster than you. (Hannah makes this mistake when she jokes that the man interviewing her for a job was a serial date rapist in college. Oops.) But, truth be told, we just don't find bodily functions as humorous as you do. Hannah makes this abundantly clear when her boyfriend Adam decides to pee on her in the shower. He thinks it's hilarious. She. Does. Not.