A semi-relevant sidenote:

Throughout most of history, witches were traditionally portrayed as riding their brooms side-saddle and with the straw part facing forward. Possibly the turn-around resulted from people generalizing the appearance of the straw part with the exhaust of an engine? Just a guess.

And, of course, vibrations are an even more recent development. Brings new meaning to the cry "I'm melting! Melting!! What a world..."