First thing that comes to mind, and the most recent.
Yesterday at work I asked a girl out. Her response....
Her: Oh, I would but I just stated seeing somebody. Where were you like three weeks ago?
Me: Actually I was seeing someone else too until about a week ago.
Her: Well at least you waited before asking me.... I like that about you, it's very attractive.
Me: Uh.... thanks.....
????
That whole scenario was rather odd start to finish actually. I didn't put the whole thing down, but it was a miasma of mixed signals.