Marathon Man (1976)

Dustin Hoffman may actually be a runner in this movie. Sidney Poitier or somebody is a Nazi who thinks Dustin Hoffman is somebody he isn't, so he tortures him dentally to get an answer to a question Dustin Hoffman doesn't remember. Then Dustin Hoffman basically takes revenge in what I think might be the cavernous basement of a zoo, and Sidney Poitier—wait, does he kill somebody with a sword that comes out of his sleeve? I think everything works out OK in the end.

Did I actually get Poitier and Olivier confused? Yes, yes I did.