Anything that takes you away from the buttons (crowd surfing, stage diving and such) are the worst idea. If, for some reason, you are back too late, the music stops. Whatever stunt you pulled before that will fall into the abyss created by the silence. You can’t be serious about private parts and flipping the bird. I mean, come on. We are supposed to be professional artists, not Marilyn Manson.
I love stuff like getting the crowd vocal, doing the odd dance move or two and even (if well timed and executed perfectly) the occasional jesus pose (about once a year max) can work. Just don’t go over the top. If you need an image, make it something constructive, humorous without being a clown. Try clothing style or attributes (hats, sunglasses, sideburns, mohawk hairdo, anything). Just remember, that kind of stuff is only good if you are consistent about it.
Greetinx,
C.