I am going through a box of PS2 games I have.  I pick out GunGrave: Overdose, and play through and beat it, thinking I hadn't beaten the game before.  I knew I had started it, but didn't think I finished it.  Anyhow, after I beat it, I go back and see it again, and see the two other characters were unlocked, and I go, "ARGH!  I already beat this game.  I remember playing as the other characters before".  

Anyone else ever do this?  Forget you actually had beaten a game in the past and went back and played it again to beat it?

I dont think Iv ever done that.

I am usually pretty good about remembering the games I have beaten. Plus if its not a memorable game its probably not playing in the first place

QFT.
Same thing for me.