Cellphone crashing prank makes talking on the phone even more annoying

This prank demonstrates that talking on a cellphone requires so much concentration, people have none to spare even to get angry at some jerk who's following them around repeating their phone conversation into his cellphone. Confusion is the order of the day as these victims, innocently organizing their day's movements, are targeted by a cellphone crasher who's like a really annoying echo you just can't get rid of.  

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