The roller-coaster portion of a desert safari: a skilled driver throws a deflated-tyre 4x4 up, down, and across the soft sand dunes at angles that feel impossible. Stomach-dropping, a little terrifying, and the part everyone films.
Genuinely a skill — drivers read the sand and let air out of the tyres for grip. Sit at the front if you don't want to feel it most; sit at the back if you do.