When I was younger, my older sisters had a couple of high school textbooks with stories by famous writers. I inherited these books at a very young age, so please understand if I can’t provide a lot of details.
The story basically revolves around a guy traveling back in time. He takes a trip as part of a vacation offer, IIRC. One of the rules of the trip is that he must not step off the walkway, or touch anything in the past, as it will alter the future. Something happens, and he stumbles off the walkway. When he puts his foot on the ground, he ends up squashing a butterfly. When he goes back to the future, everything has changed, and the guy from the tour starts yelling at him. I don’t remember anything past this.
I think it had a long title, but I can’t remember anything about it. It came up tonight because we were talking about time-travel, and the Boyfriend referenced the Simpsons episode where Homer travels through time using a toaster. It’s driving me crazy. Please help!