How about a spud gun that shoots... SPAM!
I have plans on PDF for a table top trebuchet made of card stock. Pretty neat for hurling grapes or Chi hua hua poop. If anyone is interested send me a PM.
I've seen big ones hurling refrigerators and cars. There was a guy in Merry ole England hurling people into a lake until it didn't unhook just right and one lady got planted in the ground...
"When bad men combine, the good must associate; else they will fall one by one, an unpitied sacrifice in a contemptible struggle."
Edmund Burke - 1770