I called it the Grifley.
Fourteen years old, getting handy(er) with a spanner, I decided to make something. How many here remember the Grifter? The second choice of teenagers, first for weightlifters. I'd had one quite a while, and decided it needed a pimping.
I also had a Raleigh racery style thing which was well past its use by date. So my brain put two and two together and came up with... The Grifley.
Taking the front wheel off of the Raleigh and prying the forks apart, I found I could fit the spindle bolt through both forks effectively making a crude tandem.
The Grifley required two people to ride it because the chain had to come off the Grifter part in order to make the other wheel fit. So the rider at the rear had to put in all the effort. Due to the same Heath Robinson effect in place, there was a distinct lack of braking ability, shown up to You've Been Frameable levels on her maiden voyage.
I'd roped my sister in to help, poor assistant of doom that she often turned out to be in my schemes. Not only that, I'd reserved the front seat and the kudos of steering myself, leaving her to be the twelve year old powerhouse. (Steering was as weird as you might think, considering it turned in the middle as well.)
The Grifley made it round the cul-de-sac in fine form. It made it across the juction to get us home. But when it had to deal with the slight incline of the drive, the lack of brakes (my 'unfinished' bit) proved my folly. Travelling at speed now, my only recourse to stop the rampant machine was to embed the front of it into a skip which at this point resided in the drive at the bottom.
The skip did perform well in slowing the bike(s) down. Sadly the momentum I carried wasn't erased in the same manner. I ended up face first in the rubbish. Which was where the Grifley ended up very soon after.

Lessons learnt in terms of finishing a job didn't last long, however, the next project was less bruising.
( Blind Meach Cautiously optimistic, Tue 29 Jun 2010, 11:40, 2 replies)

i had a red Grifter. I remember how cool i felt seamlessly changing gear with a deft flick of the wrist, and how at ease i felt compared to the potential castration anxiety of doing jumps etc on a Chopper. :)
(Matty73, Wed 30 Jun 2010, 2:35, closed)

But the wheely-able chopper
still commands the greatest respect. Well, I was jealous at the time.
Tried getting the front wheel up on a grifter? I put my back problems down to this!
( Blind Meach Cautiously optimistic, Wed 30 Jun 2010, 8:56, closed)