So, I found myself once again with my pianist buddy, in my cushy four-nighter mortgage-paying gig at a world-class hotel. At the end of the first set, I observed that every tune, save one, was in the key of C. This is just sick and wrong, to me. So I imposed a quickie de facto rule for the following set; play whatever you like, but we must sequentially go through the circle of 5ths, no exceptions. So, you might get "C Jam Blues" in B..... or you might get "Quiet Now" in F#. It worked out pretty well, he seemed to get into the spirit of it. Yeah, I know it's a different game on piano. He did very well. My question is; what are your favorite bandstand games to keep the brain in the game? I like impromptu key changes; it seems to be a big surprise from the bassist, although the pianist often has carte blanche to do likewise. I've enjoyed Real Book Roullette; stick your finger into the book, flip, and whatever comes up, you play. What else you got?