One of the classic stores, from the Seventies: Match Salesman proceeding east on the A3, decides to take a box of matches from a pack of them,  resting on the back seat.
Lights cigarette and returns 'spent' match to box. Then throws the box back on to the back seat, to join another 30 or so unopened packets.
Whoosh! goes the noise from the back seat, as the box ignites ('spent' match, was not quite spent!).
Driver turns round to see what the noise was, but forgets to let go of the steering wheel as he spins round.
Dave Batt (with not a CB in sight), still laughing half hour later

Picture by Andy Lambert