Nice kid, but he's getting too big for his britches.
3 seconds sound clip from the Foghorn Leghorn - Henhouse Henery (1949) Warner Bros. Merrie Melodies theatrical short.
You can hear this line at 00:02:19.480 in the DVD version of the film.
Quote context
[...]
- Now, I say, cut that out! What's it all about, boy? Elucidate!
- I'm a chicken hawk and you're my victim. Are you gonna come quiet or do I have to mess you up?
- Chicken hawk? Ha, ha, ha, ha.
- Pay attention, son. Now, get one nearer your size. A little one first. Now, run along, boy.
- Nice kid, but he's getting too big for his britches.
- Kids nowadays, they know it all.
(Foghorn Leghorn singing Doo Dah) (2)
[...]