Many aerosol products will make a nice mini-flamethrower. Back in my college days a favorite prank in the concrete-and-steel dormitories on the Tennessee Tech campus was to take a can of Right Guard deodorant and a Zippo and heat up the heavy brass doorknob on a friend's room in the middle of the night. Then knock on the door and run.

I was in a drama club on campus, and one night our director was spraying a girl's hair with silver haircolor and massive amounts of hairspray. All the while he had a lit cigarette in his hand. I took the cigarette and the spray can from him, held the lit end of the cigarette just under the nozzle, and gave it a short shot, producing an impressive blast of flame. He turned real white in the face, and for once didn't say very much for several minutes......