Recently Scott Aaronson offered a bounty of $100,000 to anybody who can prove that universal quantum computing is not possible in the real world. This was countered by a $200,000 bet, put forward by the notorious Joy Christian who argues that the EPR paradox can be resolved via topological means. He goes so far as to propose an experiment that he believes would demonstrate entanglement like correlations even for macroscopic objects - why and how this squares with the claimed impossibility of scalable quantum computing is not quite clear.
What is clear is that if they play fair, one of these fine gentlemen will lose a lot of money (although if the wait is long enough inflation might lessen the blow).
I will dedicate this page to tracking if any of the conditions of these bets are met. Comments with pointers to relevant news that might be considered a trigger for the fulfillment of one of these gambling debts are more than welcome.