Viral trend sees (mostly) young people meet to ‘release pent-up energy’ and relieve stress in fun, social setting

On a cold Monday afternoon in Hyde Park, London, a small group of people gather by the Huntress fountain chatting softly among themselves. Nothing about the group would seem unusual to passing dog walkers and runners – until they huddle together and one starts a countdown.

On three, a collective scream cuts through the park. The outburst lasts only a few seconds before giving way to laughter. They were only meant to do it once, but end up screaming again – louder, the second time.