I am rubber, you are glue

Here are the 4 things you should never tease a guy about, according to Cosmopolitan Magazine:

Money: Men believe that their financial worth reflects their inner worth. So teasing them about salaries is really another way of making fun of their manhood.

Hair: If there's anything men are sensitive about -- it's hair. Every guys worries about losing his locks one day, because he truly believes that with his hair goes his ability to attract women.

Height: And men can't do anything about their height. Although there have been many pun-yet-powerful types like Napoleon and, um, Napoleon, studies show that taller men are taken more seriously than shorter guys. And there is a commonly held belief that the taller a guy is, the proportionately bigger he is elsewhere.

Manhood: It's easy for women to tease a man about his member since they don't have one, but on guys' list of priorities, it's just below breathing. Teasing a man about his member implies you're comparing him to someone else.