One goes choo-choo the other goes chew-chew.
Shake it off
This is a stick-up.
A school teacher tells you to spit out your gum, a train says choo choo.
It was stuck to the chickens foot.
Because cars get tyred but trains do not, with the exception of Rubber-tyred metro systems.
Lots of training.
A schoolteacher says "Spit out that toffee" and a train says "Choo choo."