Probably not the ultimate test but I honestly think it would be fun as heck!!
http://improvintoronto.com/2011/10/20/dare-to-fight/Imagine this. A single ninja, standing silently by himself. Beside him sits a sign urging people to fight. Walking along the pathway, you notice said ninja, the sign, and lastly a foam sword laying at your feet. You pick it up.
Seemingly from thin air, ninjas appear.