How would you go about increasing your chances of winning a paper raffle (without buying more tickets)?

NOTE: This is for a charity, otherwise I wouldn't bother buying tickets. I'm also a greedy sunuvabitch, so I'd like to win something.

• There are several small glass jars, each for different prizes filled to varying degrees with raffle tickets (obviously the best prizes have the most tickets (ipad vs. some other dumb thing).
• Each ticket is one of these bad boys.
• I have 20 tickets in my hand, on which I've written my name and number.
• I can do anything I want with my tickets, and I am to insert the tickets into the jar myself.

I was thinking of crumpling the tickets slightly. This should prevent mine from sticking to others', as well as causing them to take up more volume and thus more likely to be grasped with a hand reaching in.