"If I'm not mistaken," says Katie Haas, the sparkplug cohost of Motor Madness (TNN, Friday, 8 p.m.), "our highest-rated show has been a demolition derby." With this week's installment bringing live coverage of the Great Lakes Car Wars from Hamburg, N.Y., we wondered why viewers seem to be so mad about watching cars intentionally crash into each other. Haas has some theories. "It's like a pillow fight," she says. "No one really gets hurt. Or maybe our viewers just identify with these drivers the most." Anyway, if things get ugly later this evening in the parking lot at the Piggly Wiggly, you'll know why.