matchbox kung-fu
Only ever do this to someone with a really good sense of humour, or someone you really don't like.

Take a normal box of safety matches, the kind with an ignition strip down each side. Now hold two matches to the sides of the box, with the heads against the strips, and place a third so that it is balanced across the ends of the first two, making a crossbar.

Now challenge your victim to break that crossbar match with a karate chop. You might want to throw in some pithy comment about how weak they are to draw them in. When they accept your challenge pass them the matchbox to hold, making sure they hold it in the same fashion as you. The force of their karate chop on the top match drives the side matches downwards, causing them to strike and burning your victim's fingers.

I've only ever done this once when I was 16. The poor girl who was my victim ran crying from the pub and I don't think I've actually spoken to her since.

I can be an evil bastard sometimes

EDIT: check replies for a (crappy) diagram of the setup
(pmsc, Mon 17 Dec 2007, 16:47, 4 replies)

Can you draw a diagram?
I can't visualise how that would work at all.
( Bob Todd whee, Mon 17 Dec 2007, 18:08, closed)

I second that
Diagram, please.
(clumsyeloquence is a girl, Mon 17 Dec 2007, 18:25, closed)

diagram


press thumb and forefinger where the green arrows are, strike top match in direction of blue arrow.
(pmsc, Mon 17 Dec 2007, 20:19, closed)

childish
but loving it, may need to try with drunken friends come new years
(pogo_it, Tue 18 Dec 2007, 15:02, closed)