Destin and the Backwards Brain Bicycle
Destin from Smarter Every Day spent six months learning to ride a "backwards bicycle"—one that has been geared so the steering wheel is backwards. Turns out it really is difficult to do, potentially as difficult as learning to ride a bike in the first place. Being a YouTube guy, he recorded the whole process, and now has a video to explain it.
Some things to watch for in this video: How hard do you think it would be to do this yourself?; How do you think it might work if someone who did not already know how to ride a bike took on the challenge?; and Did you have a sweet mullet in the '80s? (Trust me, that last one is somewhat relevant.) Behold: