A popular YouTuber named Destin of SmarterEveryDay challenged his brain in an interesting way, with a bicycle where the handlebars turn the front wheel in the opposite direction of a typical bike. For example, turning the handlebars left turns the wheel right and vice versa. He warns you it’s a lot harder than it looks.
Gears on the head tube make this possible. It was built by his welder friends who challenged him to ride it. He couldn’t at first; determined to overwrite his brain’s memory of bike riding, he practiced until he finally succeeded. It took him eight months.
When it was time to ride an old-fashioned bike, it only took him about twenty minutes to “un-learn” the Backwards Brain Bike!