Someone once hired me to create some poser comics for them and paid me using Paypal.  Over 6 months later Paypal grabbed $500.00 I had in my Paypal account because it turned out the guy used a stolen credit card to put my payment money into his Paypal account.  They also demanded I give them an additional $500.00 that I had withdrawn but I told Paypal to go fuck themselves because it was the credit card company's problem, not mine (or theirs for that matter).  As far as I'm concerned if they can't figure out a stolen credit card has been used for over 6 months then it's tough luck.

DO NOT LEAVE MONEY IN YOUR PAYPAL ACCOUNT!!!