Don't know if this has a) been posted, b) is relevant since it only involves poker players, not actually poker c) is in the right forum, but....
This thread on another poker forum is all about a staking for sports betting where the horse ran off with the funds. I've linked to the last page, but if you've got time, I'd start from the beginning. His friends all start defending him, but then the truth is uncovered.
It makes for fascinating reading, if destroying your faith in humanity. I've met the guy in my local cardroom, he seemed nice. An astonishing con.
Cliffs: Man gets staked for sports betting on Betfair to trade on soccer matches. Actually spends it all on lavish lifestyle. Lie after lie follows.