When a man has sex with a woman at the top of a stairway "doggy style," he has her facing the stairs and holding onto the top step. When about to about to come to climax, the man kicks out the woman's arms out from under her and rides her down the stairs bobsled style. The vibrations from the stairs cause an unparalleled orgasmic experience.

Warning: this sex act may cause damage to said woman's face.

When you eat dirt for the first time and leave your family to build a shack in the woods