We used to determine first player in games by having one person pick a number and one person pick a player (writing each secretly on paper or flashing some fing

We used to determine first player in games by having one person pick a number and one person pick a player (writing each secretly on paper or flashing some fingers to a third party as a commitment scheme). You'd then count that number of spots from that player. This sort of "randomness through unwitting collusion" reminded me of that. That and coin flipping protocols: https://en.wikipedia.org/wiki/Coin_flipping#Coin_flipping_in_telecommunications https://en.wikipedia.org/wiki/Coin_flipping#Coin_flipping_in... (Admittedly, shuffling an entire list seems fancier, like you're getting much more work out of it.)