you could setup a gameshow like theme at home. (or for a science project for the kids)
make button for the number of contestants
setup the sequence to light up a particular light (maybe some smart strings inside an acrylic globe)
setup the sequence to make a buzzer like audio sound.
so button one triggers a sequence that only plays on channel one with the buzzer sound.
button two triggers a sequence that only turns on a light for channel two, etc..... (or even make it flash different colors, you get the idea)
since the trigger only responds with the first button to be released, it will correctly determine your winner!
I know, kinda geeky, but it's a neat idea.