As a kid, when I first got Pokemon Blue Version, I played through pretty well, up until I got into the Pokemon Laboratory on Cinnabar Island. I got stuck in the basement without an escape rope. I tried to get my team to all faint, but I was unable to (or I was too lazy) to get my lvl. 87 Blastoise to get knocked out or run out of PP on his moves.
So of course, I was forced to restart.
My cousin and I thought that in Gold, Silver and Crystal, if you ran around Ilex Forest and surfed in the pond, you could find Celebi.
I thought the GS Ball was stronger than the Master Ball.
I thought MissingNo. was Ho-oh, but the programmers removed it.