And my personal favorite...
Vehicular vernacular for gas pedals.
*Images from an e-mail I recently received.
On a separate, but related note, I am currently reading The Detroit Electric Scheme by D.E. Johnson. It tells the story of a murder that takes place in a Detroit automobile factory in the early 1900's. While the novel itself is fictional, much of the story's background is based on historical fact relating to the production of early electric automobiles. Because the settings, the themes and even some of the characters (the Dodge brothers and Edsel Ford) really existed, The Detroit Electric Scheme has been an entertaining and informative read thus far (final review to come).