SOMETHING FOR CLANGALANG

According to Wikipedia, Quid Pro Quo comes from the Latin meaning “something for something”, indicating a more-or-less equal exchange or substitution of goods or services.
Probably it’s most famous use was by cannibal serial killer Hannibal Lecter in the movie Silence of the Lambs when interviewed by FBI agent, Clarice Starling.
Right up there with his line: “A census taker once tried to test me. I ate his liver with some fava beans and a nice chianti”.