The Springer

this is a cheap trick to fright your friends.

Step 1: You Need:

You need a rubber band and two pieces of wire.

Step 2: Bend the Wires

first bend  the two wires like the ones in the picture

Step 3: Wrap the Rubber Band

wrap the rubber band round the wires

Step 4: Finish

now wind up the rubber band and place the springer under a book, under a iPod, ...
when your friend pick up the book (iPod, ...) the springer spring around.