Oh, brother. Here I am, in the peak of my form playing second banana to some sort of a harebrain.

9 seconds sound clip from the Space Jam movie soundboard.

You can hear this line at 00:43:52 in the Blu-ray version of the movie.

Quote context

[...]

- Hmm. Me neither.

- It's a crying shame. We gotta get new agents. We're getting screwed.

- We have found the trophy room.

- Now spread out and search the place.

- Yes, sahib.

- Oh, brother. Here I am, in the peak of my form playing second banana to some sort of a harebrain.

- This could be useful. Aha.

- If this were a union job, I...

- That's very nice.

- Oh, one of his shoes.

[...]