Two more videos:
A really cruel father scares the crap out of his son:
http://www.youtube.com/watch?v=8Yw_Izc5Vq8
This office worker literally jumps right out of her chair:
http://www.youtube.com/watch?v=yHaWb3zzGjc
Both of these ones are classics
. Though the first one is pretty mean!