It appears Brady Quinn learned all about throwing teammates under the bus from his old mentor, and fellow stand-up guy, Chuck Weis.
According to this story from ESPN, Quinn gave the hand signals Derek Anderson would be using in a scrimmage to the defense so it would be harder for Anderson to succeed. You know, the same Derek Anderson Quinn is competing with for the starting Browns QB job.
Derek Anderson said the radio receiver in his helmet wasn't working Sunday, so he had to work with hand signals. Anderson said Brady Quinn, who was quarterbacking the White team, schooled White defenders on those hand signals, which made it harder for Anderson to work a drive filled with short passes.
(Thanks to reader Joey for the tip.)