Once took out a girl I met online (should have been my first red flag!) but we had been chatting for maybe half a year, and she seemed pretty cool so we decided to meet for dinner. First the chick is about half an hour late, and happens to show up just as I'm leaving.
So we sit down, and we chat for a few minutes while we wait for our food. During the course of the conversation, I crack a few jokes, as I tend to do. Eventually I notice that her laughter is becoming increasingly bizarre and boisterous. Of course, this should have been a sign to me to stop cracking jokes, but damnit I'm on a roll so I keep making her laugh (I also wanted to see just how bizarre her laugh could get). Eventually she's laughing so loud that everyone in the restaurant has stopped eating, the waiters and waitresses have stopped working, and people have come out of the kitchen to see what's making so much noise. At this point I stop attempting to make her laugh as I am now completely embarassed and never imagined her laugh could have been this bad.
Finally she stops laughing and realizes everyone is staring at her. She looks completely horrified and says, "Oh my god, I just made such an ass of myself!" I feel bad for her so I tell her it's not that bad. She gets kinda teary-eyed, excuses herself, and runs to the bathroom. She comes back out a few minutes later and apologizes. I tell her to think nothing of it and that it was entirely my fault. Just as I seem to have gotten the situation under control, the waiter brings us our food. He sits my plate in front of me and says, "for the gentleman". Then he sits her plate in front of her and says, "for the hyena". The girl then bursts into tears, runs back to the bathroom, and when she returns, we just eat in awkward silence.
I ended up giving the waiter a pretty big tip. What he said was cold, but it was funny, damnit.