Each prank has four parameters:
x-time(time in minutes or type of victim activity)
preparation time is the time required to prepare the prank before acessing the victim's computer.
Arrange time is the time of acessing the victim's computer needed to get the prank working.
x-time is the time before the prank will go off or something that the victim has to do for the prank to go off.
the instructable is in the april fools contest so please vote!
Step 1: Mouse-off prank
arrange time= 10 seconds
x-time= when the victim uses the mouse
this is a very simple and effective prank.
the victim has to have an optical mouse for that.
Just take any sticky non-transparent thing(a sticker, a piece of masking tape etc ) and seal the "eye" of the mouse.(see pic #2)
you can also stuff a little bit of paper into the sensor of an optical mouse(pics 3&4)
by doing this you replace the moving (relative to the mouse) table top, or a mouse pad by a piece of sticky thing that is still(again, relative to the mouse), so the mouse dooesn't move the pointer.