I would like to think it's widley enough known nowadays that people would think about it.
In days gone by i've heard many stories like that, though.
Mostly from people who didn't have properly adjusted headrests. People seem to think they are just there to piss you off when reversing.
(thediscokingpin, Thu 11 Jun 2009, 12:31, archived)

Mine was a side impact, so the head rest didn't do much.
The relatively minor soft tissue damage led to muscle tension, which eventually dehydrated 4 discs, 2 of which prolapsed.

Definitely should have got that stiff neck seen to sooner :-(
( Dave Trouser ; the people's choice - 75% agree, Thu 11 Jun 2009, 12:37, archived)