I beat pokemon blue. I had gotten raped by Agatha of the elite 4 like 97 times. I ended breaking my OG gameboy because I was so frustrated by her Gengar.
On my new Gameboy Pocket I traded for some legit pokemon cards I found out about missingno. (NOONE HAD PLACES LIKE YOUTUBE OR ETC to look this shit up)
I was PISSED when I figured out how easy it was. LOL