Yo-Yorotica
What about a yo-yo appeals to me? I guess it's contemplating the forces at work on a well thrown yo-yo. There's that crucial slipperiness as the string slides against the axle for as long or longer than seems possible. Then being able to introduce just enough friction at the last possible moment to bring the trick to a satisfying climax....
*ehem* -- well, perhaps it's best left unexplained
