Ooh, it must be some other mug.
5 seconds sound clip from the The Milky Way (1936) movie soundboard.
You can hear this line at 00:10:21 in the DVD version of the movie.
Quote context
[...]
- More accidents happen in bathrooms.
- Look. That's the story of the lion and the mouse.
- Truck driver knocks out champion.
- Ooh, it must be some other mug.
- Yeah, some other middleweight champion.
- There ain't no other middleweight champ.
- You're not gonna say anything to Gabby about this, are you?
[...]