Did you ever hear the story about the monkey's paw? The monkey's paw would give you five wishes, but the wishes were always messed up. Like if you wished for your dead father to come back, he would come back as a zombie. You had to word things really carefully or else. This is a total monkey's paw wish. "Mom, dad. I want cold hard cash for my birthday." / "You got it, son."
I'd ask how much money there was total then take it to Best Buy and get an X-Box with it. I'd just hand them the cold brick of cash. "Your problem now." That's how you use Judo on a prank. Judo is all about taking the energy coming at you and redirecting it. In this case you're redirecting the energy to the Best Buy employee.