The Traxxas XO-1, the world's fastest remote-control car, is no toy—the 27-inch-long aluminum-framed racer accelerates from 0 to 100 (yes, 100!) miles per hour in less than five seconds thanks to high-speed gearing and a brushless electric motor powered by lithium-ion polymer batteries. It even comes with an iPhone app and tune-up software, along with the ability to record real-time speed and RPM. Shinguards not included. $1,100; available through Traxxas.