At a party start talking about mental powers etc.
Then bet a woman $2 you can make her boobs move without touching them.
Hold your hands in front off her moving them around as if your trying to incite movement.
Then reach forward grab them and move them around, say ok I was wrong and give her $2.
(Remember to duck though.......)
Only did it once at a xmas party, was not a popular member of staff for quiet a while, well with the girls.......