Have you converted a vertical dropout bike to fixed or single speed without an eccentric hub or bottom bracket? Post it here.
How did you do it? Did you use Eric House's magic gear calculator? Did you use a half-link? Futz with various chainrings and cogs? Invoke some bad juju? Light a candle to Our Lady of Ghisallo?
Why did you do it? Are you a mechanical genius? Are you a cheap bastard? Did you just have too many spare parts cluttering your garage? Was it a drunken dare? Or just for the heck of it?
And pictures if you've got 'em. I know you do.