One of the more fun and annoying weapons in the game is the boogie bomb. It doesn't actually do damage, but if you're hit by it, you can't do anything but dance. This sounds like a cheeky weapon to add to Vigilante City.
This special grenade looks like a hybrid of an oversized grenade and a disco ball. It has a thrown range of 30'. Once the pin is pulled at it's thrown all targets within 10' must make a DC 15 Wisdom check or dance uncontrollably for 1d4+1 rounds.