Yeah, once. For a while, I had fairly long hair- Lacking the money to get it cut by people who know what the hell they are doing, I just sorta left it- and, one day, some friends of mine invited me to lunch.
Now, these friends of mine are... Well, let's say you aren't going to mistake them for anything other than the manliest of men. We're talking beards, we're talking hulking, all three of them. And there I am, with them at the table, skinny and clean-shaven with long, straight hair.
The waitress comes up, and gives us our drinks. "Here you are, guys... Oh, Sorry! And girl.", she says, tapping my shoulder.
I didn't really mind, though- my friends thought it was hilarious. And so began a running gag!