Mine has to be when a PS fanboy was trying to bash the 360 a while back, his words were "lol the xbox is so shit people do a [b]360 [/b]and walk away". Still makes me laugh now at the stupidity XD
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*black guy on gears of war 1 in the lobby after I blindfired him with the longshot* "-blam!- YOU A CORNBALL!!" Me and my friend instantly died laughing because it was the worst insult ever.