If you saw that ball pit prank from the US and got supremely jealous that you're too old to buy/visit one for yourself then you might want to buy some flights to London pronto as creative agency Pearlfisher have created one just for you.
Based in Hammersmith, 'Jump In!' is based in the Pearlfisher Gallery in Hammersmith, is free, and contains 81,000 white balls for you and 29 other people to flop around in to your heart's content. And to make it even better, Pearlfisher are donating £1 for every visitor who comes to the installation to charity.
But you may want to move fast, as the exhibition is only on until January 31st.