How is the wonky bike trick/con done? The one where you steer it left and it goes right and vice versa?

It's done by the addition of cogs between the steerer stem (that attaches to the handlebar) and the steerer tube (the tube attached to the fork yoke which passes through the head tube of the frame). There's a picture of a rather crude one here: a href="http://www.weiwong.com/post/random-bike-5-reverse-steering-bike.aspx" rel="nofollow"http://www.weiwong.com/post/random-bike-…/a Crude, but makes it easy to see how it's done!