While I'm peeing I hear someone trying to open the door. No big deal since I knew it was locked.
Then, I hear what sounds like a dude throwing his shoulder against the door.
After that I hear someone try to deal with the door handle again.
Finally, I finish pissing and leave the stall at which point I see the dude who clearly wanted to get inside.
He said "Pardonez-moi. Je ne comprend pas le system ici."
To which I can only think "What fucking system do you not understand? If you are in a bar and need to pee and you try to open a bathroom stall and it won't open that probably means someone else is either taking a piss, getting a blow job or doing coke. Either way, fucking wait your turn!"