I am the unstoppable monster. At least, several of my nieces and nephews think I make a great monster, though I am technically stoppable, when the right number of children swarm and tickle me. Then everything degenerates into 'bop uncle with pool noodles until Mom says it lunch time, or the kids get tired.'
OT: I'm an SCA heavy fighter in training; there's nothing that I can't negotiate with, using the end of a stick.