Oh, I have had a good few laughs now xD don't feel bad though. I do stupid stuff in every game I own... take Resident Evil 4 (Wii edition), there are 4 bear traps (You know, the foot trap thingy's with big metal pointy things xD) so I shoot 3 of them, because the 4th one was out of the way, and I didn't want to wast ammo, guess what I do, walk right over the trap, because I thought I saw handgun ammo :(:(:(:( but that was offtopic.
Hmm... Pokemon mistakes eh? Well, in Mystery Dungeon (Blue) I went to battle Zapdos, and I use this strategy right? I get Electrike or Manectric to join my team, because they absorb electric attacks, but when I got in, I forgot to get the friend area first... I died, lets just leave it at that.
I also have killed a legendary without thinking... I think it was Rayquaza. But I was fighting and got frustrated, I said to myself 'I'm gonna kill this thing in a sec' because it wouldn't stay in the ultra ball, then I had dinner, left it on sleep mode, and when I came back I used my most powerful attack and killed it, I looked at it for a bit, then I clicked, I went 'GOD DAMMIT!' when I realized :(
Speaking of sleep... it's 5:53am here at the moment, and I haven't slept a wink... I am gonna be sooo tired later... ah well!!