If your grandpappy read the road tests of Tom McCahill of Mechanix Illustrated he probably shared his sense of humor.

From Wikipedia:

McCahill frequently used extreme metaphors and similes in his prose. For example, in Mechanix Illustrated he described the AC Cobra as "hairier than a Borneo gorilla in a raccoon suit". He proclaimed the ride of a 1957 Pontiac to be as "smooth as a prom queen's thighs". The 1957 Ford "cornered as flat as a mailman's feet".

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