I thought I could use this as an excuse to play a Rock, Paper, Scissors tournament and then someone suggested I play a Rock, Paper, Scissors, Lizard, Spock tournament:
Most students had seen the game but to help us along with the rules I put this up on the board (source: wikipedia):
We then proceeded to play a 16 player knockout tournament that +Jason Young kindly helped run. Student were matched up and played best of 3 rounds with sudden death.
Here are the results (open the image in it's own tab to view it in detail):
We're not quite playing at Nash equilibrium (which would imply a uniformly distributed choice of strategies) but it's not too far off.
Here are the strategy profiles of all matches that won a game: