... and we'll hold it until after you've died and been reincarnated. It's true.
The idea is that you start by believing in reincarnation and then put a bunch of money in the Reincarnation Bank. When you pop back into the world in your new life, you've got money in the bank.
Interestingly, this scam, designed for some of the stupidest people on the planet (Can you hear me down there in Montgomery County?) doesn't have a mechanism for actually withdrawing any money.
PZ Myers presents the "bank" with an even more delicious dilemma.