Uh-oh. I lost all my muscles. The vitamins must have worn off. I better go get some more.

5 seconds sound clip from The Ant and the Aardvark (1969) - Don't Hustle an Ant with Muscle (S1E15).

You can hear this line at 00:05:16.633 in the Blu-ray version of the episode.

Quote context

[...]

- Yeah, I know. In the meantime, I'm hungry. Go get me some lunch.

- You mean, me get your lunch? What do you think I am, your waiter? Well, in that case, may I take your order, sir?

- This is humiliating, that's what it is. I never thought it would happen to me. An aardvark bringing lunch to an ant.

- A very fine lunch.

- Oh, hey, Aardvark, I might be hungry again right after I take a little nap. So stick around.

- Uh-oh. I lost all my muscles. The vitamins must have worn off. I better go get some more.

- Aha! So that's how he got so strong: with vitamins!

- You see, Ant, you're up against an aardvark's superior intellect.

- I know you got your vitamins down there.

- I knew it all the time: without your muscles, you're a coward.

[...]