Across the Pond, they don't call them pits.

Ball pits are up there near the top of the list of lost childhood joys. Most of us just assume adults can't re-create the experience of a childhood ball pit.* It's like drinking Crystal Pepsi or having your first cigarette—it's never coming back. We're too big now, the pits aren't deep enough to jump into, and plus it's nearly impossible not to look like a perv. All those problems have been solved now at Jump In!, the adult "ball pond" in London run by the ad agency Pearlfisher (ugh, "ball pond"). Playing in the pond costs one pound, all of which go to benefit the charity Right To Play, a group supporting educational and recreational opportunities for children in war-torn and impoverished regions across the globe.

Sources: Jack Hart