I recently heard the greatest commentary-track comment ever. I rented Pitch Black, a film I saw in the theatre. Early in the movie, Claudia Black's character is face-to-face with an unknown crash survivor. The director, visual effects guy, and producer all stop their banter for the scene. The unknown character says a line, and then gets shot several times from behind.

Blood splatters Claudia, twice, across the face and neck.

Someone, probably the director, says...

"there was something vaguely sexual about that, isn't there..."