A common theme in the Open Sicilian - especially the Najdorf - is when White sacrifices a Knight on d5.
Here are three of my tournament games where I went for the sacrifice. Incidentally, the games were played within a month of each other (about 6 years ago) in 3 different tournaments.
I decided not to add any comments so the readers could figure out for themselves whether the sacrifice is sound or has merit.
Lastly, for those who clicked this link expecting high level games and not my amateur escapades (sorry), I provide two games by none other than Mikahil Tal where he employs the Knight sac.