FF8 - got really bored with it.
Halo - Some error kept me from getting to the last level.
FFT - Again, got bored.
Chrono Trigger - I got really far in it, but never got to finish it. I've always wanted to, but I can't stand going through a game again.
HalfLife - Because I fail at life.
Windwaker - I don't know WHY, but I just upped and stopped playing it. I'm at one of the last dungeons, and could go play it.. but.. meh.