It's been a long time since I read a review that was so unabashedly ANGRY about having to sit through a movie that I wanted to plunk down my $8.00 to see exactly what all the fuss was about.
Read CNN's furious review of "A Sound of Thunder"
The film is based upon a short story of the same name of the film by Sci-Fi Statesman, Ray Bradbury. It's considered a sci-fi classic and has spun a thousand bad time travel rip-offs in comics, TV, film, etc... But the original short story pretty much boils the concept of why time travel is a bad idea right down to its essence.
Anyway, Jamie will never let me see this film.