The Trouble With Trillions - S9-E20
IRS Agent: Mr. Simpson, this government computer can process over nine tax returns per day. Did you really think you could fool it?
The Trouble With Trillions - S9-E20
Kent Brockman: This is Kent Brockman live at the Springfield Post Office on Tax Day. It's literally the 11th hour, 10:00 PM, and tardy taxpayers are scrambling to mail their returns by midnight. Sir, why did you wait until the last minute to pay your taxes?
Otto: Taxes? Isn't this the line for Metallica?
Kent Brockman: Sir, uh, why did you wait until the last minute to pay your taxes?
Krusty the Clown: Because I'm an idiot. Happy?
Answer: I'm not sure if this is the one you're thinking of, but an episode of "Ray Bradbury Theatre," called "A Sound of Thunder," dealt with a similar matter: a group of hunters travel back in time to hunt dinosaurs, only to find things have changed when they get back because someone stepped on a butterfly.
Xofer