Twice actually.
1) Sonic Heroes on GCN. Due to my old Gamecube's faulty laser the game was jittery and would crash so and so often, but I just couldn't resist playing it and tried beating it until I finally could. (a lucky streak of not freezing so to speak)
2) Metal Gear Solid 3 on PS2. The whole game was working perfectly fine, up until The Boss. 8 out of 10 tries the game would freeze due to the disc being all scratched. Put some toothpaste on the disc which temporarily solved the problem and gave me time to beat the game (it wasn't working very well though, but at least it didn't hang itself)
*I had the MGS CD buffed at a local video game store last March or so, since then it's working perfectly fine again.
Lyrics: He He He He Ha Ha Ha!
