When you are having sex with a girl with a bra full of coins, but can't hear the coins jingling. Then when you take off her bra all the coins fall out and she yells "JACKPOT!"
One night I went out to a dance club with my friends and got incredibly drunk. Throughout the night I was putting the change leftover from buying drinks into my bra because I didn't have a purse. I ended up going to my boyfriends place afterwards (who hadn't been out with us) and being the terrible drunk I am I conned him into having sex. We were going at it pretty hard, he was laying down and I was on top of him and he finally had the mind to take my bra off. When he did, all the change from the night ($21 in coins..) burst out and rained all over his face. As he was confused and spluttering I just drunkenly continued while yelling, "JACKPOT!!!" and grabbing the cash and throwing in the air pulling a Bellagio Slot Machine. I'm surprised that we're still together.