Man, why do you do that to yourself?
4 seconds sound clip from the Blazing Saddles (1974) movie soundboard.
You can hear this line at 00:34:34 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, I don't know. Play chess... screw.
- Well, let's play chess. Checkmate.
- What?
- Why, you devious son-of-a-bitch!
- Man, why do you do that to yourself?
- Oh, you don't really want to know that.
- I don't know if you ever heard of me before, but... I used to be called the Waco Kid.
[...]