My favorite version of the technique is getting someone to "protect" me from someone else. For example, after my opener, I'll say, "Listen. There's someone here I'm desperately trying to avoid---I can't tell you who it is--- but you'd be doing me a big favor if when you see me doing this," and I show them some subtle hand or eye signal, "you'd just come over and check up on me if you can." Naturally, people want to know who it is and why I am avoiding them. I won't be able to tell them, of course, having made the whole thing up, but it makes for great conversation. Also, usually what happens is that the person or people will keep checking up on me to see if I need protection even if I don't give the singal (which I usually don't). If you tell a few different sets of people this story, you can get a big rush all evening, and everyone will wonder what your secret power is.