It is an American movie, not older than 20 years.
The opening credits is a fight between two CGI scorpions, I believe on a desert road. The opening credits end when one of the scorpions win, but then (I think) it is ran over by a car. The scene I'm talking about is shown very close range and "filmed" in a way that makes it look like a giant monster fight. I do think they're also black and yellow, but I'm not sure.
I can't think of any connection between this scene and the rest of the movie, that's why I can't recall which movie it is. Google returned me documentaries about scorpions, Mortal Kombat, The Scorpion King and Clash of Titans. I'd appreciate the help.
Edit: So, a few things. Because the tone of the sequence was almost mockery, the movie is probably a comedy or cheap action flick. Definitely not a drama. The scorpions are CG, but not very good. So probably from late 90's early 2000's.
I am fairly sure this takes place in a desert and the scorpion that wins is squashed by a car, so the only connection it has with the movie is someone driving to a city in a desert (maybe Las Vegas?).