This video needs a song =)

What climbs a hill, for a thrill, and makes the happiest sound
what bounce up and down, can break your crown
Everyone knows it's quads
The best present yet, to give or to get, the favorite all over town
The hit of the day when you're ready to play
Everyone knows it's quads
It's quads
It's quads
For fun it's best as a toy
It's quads
It's quads
It's the favorite of girls and boys!

watching that I couldn't help but be reminded of the old slinky commercial =P

Even funnier, my [future] bro-in-law is getting a pair of quads with my sister.