I'm really enjoying the silly bikes. The really funny thing about the reverse-steering bike is that it'd be fine to ride no-hands but as soon as you put your hands on the bars it all would go to hell. That Co-Mo tandem is a gag I've never seen before and I don't know why. It wouldn't be hard* to do a bike frame out of all kinds of recognizable tubing or balusters or whatever.

*for a frame builder, not me