Holy shit. I actually found one today, and I got it on video. I will upload it soon but for now I'll describe it. I was playing loud music, and pumped and button mashed a little. And then it happened, I jumped, grab the dude in mid air, slid backwards and sliced his upside down neck, and landed on one foot, tottered, and switched to the other foot (looked like drunken master) dunno WTF it was but I'll show you.
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er I don't know how to post a video to here, I'll do it on youtube then add the link.