He's a southpaw. I don't want you messing around with southpaws. They do everything backwards.
5 seconds sound clip from the Rocky (1976) movie soundboard.
You can hear this line at 00:33:40.902 in the Blu-ray version of the movie.
Quote context
[...]
- Exactly what are you looking for, Apollo?
- This is what I'm looking for. The Italian Stallion.
- Rocky Balboa? Never heard of him.
- Look, it's the name, man. The Italian Stallion. The media will eat it up.
- He's a southpaw. I don't want you messing around with southpaws. They do everything backwards.
- Southpaw nothin'. I'll drop him in three.
- 'Apollo Creed meets the Italian Stallion'. Sounds like a damn monster movie.
- Hey, what are you doing with that bat, huh? I used to be deadly at stickball.
- You sure your sister knows I'm comin'?
[...]