That boy's about as sharp as a bowling ball.
3 seconds sound clip from the Foghorn Leghorn - Sock-a-Doodle-Do (1952) Warner Bros. Merrie Melodies theatrical short.
You can hear this line at 00:03:33.210 in the DVD version of the film.
Quote context
[...]
- The trouble with you is you're out of condition. You're flabby.
- His muscles are as soggy as a used teabag.
- Boy, what you need is a good workout.
- Yeah, yeah, yeah. Workout. Workout.
- Listen to me, boy. Pay attention when I'm talking to you.
- That boy's about as sharp as a bowling ball.
- Hey, what's the big idea swatting me on the schnozzle when I'm sleeping?
- When I hear the bell, I just gotta start punching something.
- Yeah? Well, what you doing around here?
- My friend over there said... Would you kindly let me have the punching bag?
[...]