What is the most scrub thing you've seen a player do in any raid? It doesn't have to be a noob either, because we've all done some stupid stuff from time to time.
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Saying they've done it and know what to do when they really don't but they're too afraid they'll be kicked and cause tons of screw ups. Nothing will get you kicked faster than faking knowing stuff. Why I always ask people if they know it or not. I'll sit and explain everything to a guy if they don't know it, or if they come clean within one or two attempts before I get frustrated. I've yet to kick anyone myself, but I've seen groups kick people before who cause tons of wipes.