Really soft sticky racing tires esp. when used on the street. In street use you may only get 1500 miles/tire or less, but hey, if it keeps you from sliding into oncoming traffic.
Bob doesn't ride his bike to work anymore, he's saving the gumballs for Saturdays in the canyons.
The lost art of either punching out the front teeth of a female, or carefully removing her denchers, and then proceeding to fuck her bleeding gums until satisfaction.