Rings of Power:
While I was trying to get the Ring of Perfection, I eventually managed to get both the sun and Moon gems, then proceeded to spend weeks looking for the chamber where you're supposed to put them, even though I had already found the paper with the co-ordinates for the Chamber, for some reason, I got it into my head that the paper was pointing to where you got the two gems. In my defence, I was only about ten at the time.
Snatcher, Act 3:
Spent ages trying to get past the green Insectors, got to where Jamie is, hesitated for a second because she wasn't attacking, and then decided that after I'd spent so long trying to get past thoses Insectors, I wasn't going to give her a chance to attack.
I wasn't too happy.
Ace Attorney: Justice for All, Case 3.:
Said the bust was under the Prosecution's desk, since Franziska had searched the room before Phoenix got there. Didn't actually think about the fact that Franziska probably couldn't have carried the bust into the courtroom.