"YOU'VE BEEN PUNKED!!!" whats the best prank call you've ever made?

i have a friend who is competeting with me to prank call each other. he says ill never get him, but i know i will. i just want to make sure he doesnt know its me and doesnt suspect its a prank call at all. i want to "punk him" just like ashton kutcher does, but only through the phone. any good ideas? =P
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