Then someone goes and does one on top of a 40 storey building, and we're forced to change our parameters.
The stunt is the work of Scott Young, who admits he "put his life on the line" for the dangerous video which was shot in Shanghai.
"With winds picking up, it was no easy task," the team behind the clip said.
"But true 3RUN style, he pushed past all limitations, to provide mad content and inspire the world."
Needless to say, don't try this.