Because cars get tyred but trains do not, with the exception of Rubber-tyred metro systems.
Clark your car in the garage!
A girl scout that got hit by a car.
A school teacher tells you to spit out your gum, a train says choo choo.
The optimist sees the light at the end of the tunnel. The pessimist sees nothing. And the realist sees the train.
Because it is two-tyred.
Because it was two-tyred.
Because there is no try.
They're both under DC.