about ten years ago...
as i cycled down the street in my small market town, a van drove past and the man in front gestured to me to pull over.
doing so, he opened the side of the van and showed me 2 large loudspeakers - complete with a supposed store display card showing the RRP.
we had a pair left over, he explained - you can have them for £400.
i said no and left, later i heard that it was a regular scam - the speakers were cheap crap essentially.