In motion picture terminology, a tracking shot is a single continuous shot made with a camera moving along the ground, following the movements of the subject. Why this topic? Because I just watched Goodfellas for the 400th time, and there's a famous one midway through the movie.
Touch of Evil
Strange Days (audio NSFW)
Snake Eyes (2:40)
Boogie Nights (audio has been changed)
Here's that Goodfellas tracking shot I mentioned.
Mallrats (alternate opening)
And we'll end with this rather slow alternate opening to Mallrats. What other tracking shots do you remember?