I, (Annoyed Grunt)-bot - S15-E9
Robot Rumble Announcer #1: There's no love lost between these emotionless devices.
Scenes From a Class Struggle in Springfield - S7-E14
Tom Kite: You know Homer, the traditional way to cheat in golf is to lower your score.
Homer: That's one way.
Tom Kite: Ha ha, I'm PGA Tour pro Tom Kite. How 'bout I give you a few pointers on your game? Now you don't want to overthink.
Homer: Not an issue.
Tom Kite: Keep your head down.
Homer: [Raises head] Huh?
Tom Kite: Pretend there's no-one else here. [Homer scratches his butt with the driver and then belches.] And just go at your own pace. [Homer hits the ball onto the green.] Wow, very impressive. You're a natural, Mr. Simpson.
Homer: Really?
Tom Kite: Uh huh. All you need is your own set of clubs. [Takes his clubs back from Homer.] And stay the hell out of my locker! You can keep the shoes.
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