In WoW one knight I was feeling pretty good after melting down a couple of mages with my Shaman. I'm a medium-good player so this sort of victory had me high on life. Well, standing on the Zepplin platform outside Org I get zerged by a bunch of alliance rogues being spam-healed by paladins. No real dishonor or shame in that, but I was feeling cocky, so I called in my guild and we lined up like 10 players to weed them out. Then, I see one of the paladins is really low and mana, I think to myself "well, I'll jump him real quick with my awesome shaman powers and the guild'll jump in behind me".
But I forgot serveral things:
-to check my guild's status, over half of the casters were just finished buffing so they had no mana.
-to inform anyone of my amazingly dumb plan.
-to wonder where all thsoe rogues went.
Long story short, I charged in, got pasted without ever doing anything usefull, and got half my guild killed when the now-alert alliance jumped the still-medding casters. Yeah, THAT was humiliating.