What you need to do is get 2 computers that are next to each other and sit yourself at 1 and the person being pranked at the other. Ask them if the have a spare pen or something like that and when they go to get it out of their bag switch the mouse on his/her computer with your mouse. When the come back and start trying to get into a program the little mouse on your screen will go flying around but you need to act as if your computer is perfectly normal. Ocasionly move their mouse a little bit so they get excited and think that its working. When the ask you for help tell them you don''t know and that they should get a teacher or someone who would know and when they''re gone switch the mouse back. When the teacher comes the computer will be normal again the victem will be completly lost!
