The game - in which competitors attempt to keep their nerve while a colleague hurls a large beachball directly at their face - is taking London's workplaces by storm.
Pictures of players grimacing with fear as they await the impact of the ball, and frozen in shock after it has rebounded from their nose, are being forwarded to friends via the internet, ensuring the popularity of the game...
The rules are simple. Players sit opposite each other, 10 feet apart. They are not allowed to flinch or move. Each hit to the face scores a point and gives the thrower another shot
The game was invented by Dunstan Orchard and John Allspaw, two American employees at photo-sharing website Flickr.
They told how they first started throwing beachballs at each other when they found a batch of promotional balls left over from an office party.
"It's actually enjoyable getting hit in the face by your opponent. It's an excellent way to relax."
— Red Panda, Faceball Furball, Light Reading