Hack your someone's keyboard and make him type "You are a fool" simultaneously

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Set wshShell = wscript.CreateObject("WScript.Shell")
do
wscript.sleep 100
wshshell.sendkeys "You are a fool."
loop

Save it as "Anything.VBS" and send it to him.

Note: Dont try or open this file if you dont know about this.

if any problem occurs just restart the system.