I remember reading this short story back in grade school and for some reason I remembered this story today.  It's a good read and if you've never heard of it then you can read it here.   
 
Also the title to the movie "The Butterfly Effect" starring Ashton Kutcher refers to this short story.  

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JK, I'll probably get around to reading it later, but I'm lovin' the new addition to your avatar :P

Agreed, great short story. Read it a ton of different times during school.

The movie makes SyFy originals movies look like Shakespeare. Its a must see.

I had no idea when seeing it it was based on a classic short story. And now that movie probably stained my perception of the book if I ever read it. In between all the nonesense and awful, just awful, special effects, I did see a pretty interesting idea for a story though. Were there dinosaur baboons in the book? The movie. Its got dinosaur baboons.