oh, you really did make a thread out of it. So that's what he meant when he said the hard part was leaving?
I haven't really had this problem because I don't go out enough, especially in large group atmospheres to have to tell people i'm leaving. I've done it once though, I had to leave early at a sleepover at my school, I had to get a ride home in the middle of the night out of SA frustration. The lady that drove me really did not want to drive me... it was very awkward... and then everybody asks me why I left, I just said that I was feeling sick.