Fischer vs. Donner, 1966

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'In a game between future World Champion Bobby Fischer and Jan Hein Donner, White had a probably winning advantage; Black had just moved 29...Qg5–f5 and White fell for a swindle. Fischer touched his bishop, intending to move 30. Bd3, which seems like a natural move, but then realized that Black could play 30...Rxc2, and after 31.Bxf5 Rc1 32.Qxc1 Bxc1, the game would be a draw, because of the opposite-colored bishops endgame. After touching the bishop, he realized that 30.Bd3 was a bad move, but since he was obligated to move the bishop, and other bishop moves were even worse, after several seconds he played 30.Bd3. The queens and rooks were exchanged (as above) and a draw by agreement was reached after the 34th move. Had Fischer won the game, he would have tied with Boris Spassky for first place in the 1966 Piatigorsky Cup tournament.' ~ en.wikipedia.org

Unzicker vs. Fischer, 1960

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'The touch-move rule produced a disastrous result for Fischer in his game as Black against Wolfgang Unzicker at Buenos Aires 1960. After 12.Qg3 Fischer touched his h-pawn, intending to play 12...h6. He then realized that, because of the pin on the g-file, White could simply play 13.Bxh6; 13...gxh6 would be illegal, since it would put Black's king in check by White's queen. Having touched his h-pawn, the touch-move rule required Fischer to play either 12...h6?? or 12...h5??, an almost equally bad move that fatally weakens Black's kingside. Fischer accordingly played 12...h5?? and resigned just ten moves later—his shortest loss ever in a serious game.' - How to Beat Bobby Fischer (2nd ed.) by Edmar Mednis (1997) Dover