The Segway PT is basically a two-wheeled, self-balancing battery-powered electric vehicle that was invented by Dean Kamen. The name is a homophone of the word segue, meaning smooth transition. PT is an abbreviation for personal transport. Continue reading to watch the ultimate FAILS compilation.

Computers and motors in the base of the device keep the Segway PT upright when powered on with balancing enabled. A user commands the Segway to go forward by shifting their weight forward on the platform, and backward by shifting their weight backward.

The Segway detects, as it balances, the change in its center of mass, and first establishes and then maintains a corresponding speed, forward or backward. Gyroscopic sensors and fluid-based leveling sensors detect the weight shift. To turn, the user presses the handlebar to the left or the right. Segway PTs are driven by electric motors and can go up to 12.5 miles per hour (20.1 km/h).