I picked up this little reference at MIT's Technology Review today. So much for security!

Will Trade Passwords for Chocolate 

Darn, why can’t I do high quality research like this? Seventy one percent of the office workers surveyed at Liverpool Street Station in England were willing to reveal their passwords in exchange for a chocolate bar. This amusing story in Security Pipeline by Mitch Wagner has all the details.

(BTW,This was originally posted by Simson Garfinkel, I can't take credit.)