1. The ability to stare directly at a stranger on the metro and feel zero awkwardness.
In Paris you can’t be afraid of a good staring contest. People will give you the once-over, the up-down, or just generally look right into your eyes as though they’re trying to pick apart your soul with their gaze.
You get used to it, and eventually you initiate the stares. You have no problem scrutinizing the man in the corner of the metro or turning your head to look directly at the girl behind you. And when someone catches you staring, you don’t blush or drop your head in embarrassment — you simply stare right back as though making direct eye contact with a total stranger for no reason is the most acceptable thing in the word.