Augusta National is famous for its plentiful and inexpensive food options. Many opt for a pimento cheese sandwich. Others go for a club sandwich, biscuit, any number of options. Bubba Watson bypassed the regular menu and instead decided to chomp down on the shaft of one of his irons.
Watson didn't actually eat his club, of course, but that still can't taste very good. Then again, this came in the midst of a stretch of five straight birdies, so I guess whatever works.