A colleague sent along this video from Smarter Every Day where he shows how he "unlearned" how to ride a regular bike and learned to ride a bike which handles opposite to the expected way. And then tries to re-learn normal bike riding. Fun ensues. And the interesting comment that just because you know something, it doesn't mean you understand it.
[youtube https://www.youtube.com/watch?v=MFzDaBzBlL0]