Bart Gets an Elephant - S5-E17
Homer: Look at these bills: chains for elephant. Shots for elephant. Over-sized decorative poncho?
Bart: Technically it's for a giraffe, but I think I can let it out a little.
Homer: Well these bills will have to be paid out of your allowance.
Bart: You'll have to raise my allowance to about a thousand dollars a week.
Homer: Then that's what I'll do, smart guy.