Before the invention of circular racetracks, people were forced to get their daily lateral eye workout by watching jai alai or walking around with constantly shifting eyes. Take in some fast-paced visuals with today's Groupon: for $39, you get admission for two adults (a $26 value) and two youths under the age of 16 (an $18 value) plus four monster meals (up to a $36 value) and a gift-shop gift certificate (a $3 value) at Pittsburgh's Pennsylvania Motor Speedway in Imperial (up to an $83 total value). Today's Groupon is good for 15 scheduled Saturday night races.

Under the bright lights at PPMS, rogue speedsters zoom around a half-mile clay racetrack in careening caravans of super and semi late models, E-mods, cadets, and young guns. Spectators unsated after tailgating in PPMS's free lot can fuel up with a monster meal that includes Pizza Hut pizza, a burger, chicken, or a hot dog, cotton candy, a drink, and a side such as pretzels. Scoop up some swag in the Speedway gift shop with a $3 gift certificate, and bedeck your ride with a checkered racing flag or a hood ornament of life-size echidna. Racing fans under age 7 get in free.