Many moons ago...
...before Manston became an international airport, there was a bit of a semi-unofficial drag strip on the perimeter road. Used to go there on my Yamaha XS1.1 for a bit of a blast, and once there was a Reliant Supervan there that looked a bit odd. After a bit, we realised it had four wheels. Looked through the window, and the drivers seat is a good few feet further back than normal, to make room for the 6 cyl 4.2litre Jaguar lump that now powered it. Owner said he loved coming up behind Salestwats sitting in the fast lane at 80mph and flashing them over, then changing into top as he passed them............. Said the handling was frightening as fuck though.
(Colonel Blink is now officially a pretentious prick, Mon 16 Apr 2012, 21:27, 2 replies)

It wasn't a Reliant Kitten, was it?
A chap I used to practice karate with had a hobby of putting large engines in small cars, a Kitten being one of them.

The only real giveaways were the bigger wheels and the twin fans for the radiator poking out of the front.
(Kliper Filllets Getting noticed by twats on the internet since, Tue 17 Apr 2012, 8:01, closed)

.
I once (ooh, must have been over 20 years ago) saw a puke green one blitzing off a Sierra Cosworth on the A58 near Wetherby. It was only as it passed us that we glimpsed the massive hotrod rear tyres and twin front wheels. As the Cosworth passed us (what seemed like) minutes later, we gave the driver a sympathetic wave.
(Chickenwire social lubricator extraordinaire, Wed 18 Apr 2012, 15:34, closed)