A non-profit organization in India has pioneered the use of zero-rupee notes. The idea is that when a citizen is asked for a bribe, he hands over a zero-rupee note in protest.
I would have thought an official demanding bribes would be shameless, but surprisingly, this seems to work:
Fed up with requests for bribes and equipped with a zero rupee note, the old lady handed the note to the official. He was stunned. Remarkably, the official stood up from his seat, offered her a chair, offered her tea and gave her the title she had been seeking for the last year and a half to obtain without success.