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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I was doing so badly in a Halo 3 match once that somebody started screaming "[b]Turn off your Xbox, sell it, sell your tv, sell your games, sell your controller, and buy a gun and kill yourself!!![/b]" Suddenly I was pretty happy to be losing. I had never laughed so hard at an insult before.