How can I make a physical randomized trigger?
There is a board game called "Pie Face" that uses a randomized trigger to release a hand that has whipped cream on it- which splats into your face. So the trigger cant be so strong that it breaks your nose, but fast enough to hit ones face before their reflexes dodge it.
I would love to get my hands on one of these to figure out how the mechanism works, but the game is unreasonably expensive. Anybody have any ideas?