1. Act crazy
2. Yell, make weird comments
3. Drink, or have a beer at the table and act drunk
4. Talk incessantly
5. Tell bad jokes. Constantly.
6. Make ridiculous declarations, like "I think I'm going all-in this hand" before the shuffle, and then do it if you get aces or kings
Generally acting weird makes people thinking all in terms of "does he have it, or not?" They don't think, hmm maybe he's semi-bluffing a flush draw. It's "Does he have aces, or 2-7?"
Also, don't play in games where you have to do things to get action. Just find a better games. I like games where I can not say a word, bet only the nuts, and get called.