The Simpsons Season 3 Episode 24
Brother, Can You Spare Two Dimes?
When the Nuclear Power Plant causes Homer to become sterile, he's awarded $2,000 in compensation. Meanwhile, Homer's half-brother, Herb (Danny DeVito), now homeless, returns to Homer with a plan to regain his wealth. Herb just needs $2,000 so he can invent a device that translates baby gibberish into coherent speech.