The law of entropy says that energy dissipates if not contained. But humans like to localize their energies, and thankfully so because some of us have some pretty sweet cars. There's no better place to see a hundred or so collector cars than the free Scottsdale Pavilion car show, every Saturday night. The Pavilions Car Show is a weekly gathering of gearheads from across the Valley; the show's Web site says it's the "the largest consistently run car show in the United States."

The cars start rumbling in around 4 p.m. every Saturday, but it takes a couple of hours to fill the parking lot near Best Buy and McDonald's on the north side of Indian Bend Road (just off Loop 101).

By 6 or 7 p.m., the parking lot is usually stocked with hundreds of cars, from vintage classics to modern-day imports with coffee-can exhaust tips. Clusters of make/model and year form naturally.

You'll find rows of 1950s Chevy Bel Aires, followed by 1960s Camaros, and, across the way, vintage Mustangs and '32 Fords. You'll also find a few rows of newer rice-burners, including tricked-out Toyota Supras and Acura NSXs, as well as the usual wanna-be Honda Civics and Volkswagen Jettas with crappy fiberglass ground effects.

If you work up an appetite or just want a milkshake, that McDonald's is a few paces away, and a 5 & Diner is across the street.