I loved this video from Smarter Every Day, where host Destin Sandlin learns to ride a bicycle that has been custom welded to reverse the handlebars.

It sounds easy—all you have to do is think left when you normally think right, and vice versa. Can’t be too hard, right? But it is hard… very hard.

After he learns to ride the reverse bicycle, he then has another big problem: how to switch back to an ordinary bicycle. Turns out that’s really tough, too!

Lesson: “Once you have a rigid way of thinking in your head, sometimes you cannot change it, even if you want to.”

Chris Guillebeau is the New York Times bestselling author of The Happiness of Pursuit, The $100 Startup, and other books. During a lifetime of self-employment, he visited every country in the world (193 in total) before his 35th birthday. Every summer in Portland, Oregon he hosts the World Domination Summit, a gathering of creative, remarkable people. His new book, Born for This, will help you find the work you were meant to do. Connect with Chris on Twitter, on his blog, or at your choice of worldwide airline lounge.

Image courtesy of Blubel.