Ok!! I'm not crazy,

but this is the only forum I belong to.
My wife and I were discussing something tonight and cannot remember what they are called. So....I am putting the question to the smartest people I know.
They are electric, kinda like a unicycle. You stand on a little platform and when you want to go forward your lean forward and when you want to stop or go back, you lean backward? They have two wheels, side by side....well one on the left and one on the right of the platform.
Any ideas?
Thanks...Mike G