
Evento's BuzzBall is essentially a personal roller coaster, which reportedly features a "single seat inside a large outer ball that's able to spin and roll independently of the ball itself" alongside a pair of electric motors used
When the Buzzball moves the pod inside the ball is in upright position until you, the pilot, change the direction. Then the pod moves in the opposite direction of the ball’s and this is when the nausea-inducing fun begins.
Source