Kids today are bored, and armed with ridiculously small and useful cameras.
Many of them also live near to radio towers, skyscrapers or cranes.
Stuff's going to happen.
The latest entrant into the genre is this clearly terrifying clip filmed atop the Centre skyscraper in Hong Kong, 1,135 feet above the city.
And while we would never condone, encourage or recommend anyone ever climb something stupidly high, just for bragging rights, the trend of vertigo-inducing videos and selfies filmed by daredevils (both sponsored and un-sponsored) certainly makes for compelling viewing.
To mark the literal ascent of the vertigo selfie, we've compiled our favourites into one handy, horrifying collection.