I think most people will not find so much joy playing with water and a GoPro as compared to the astronauts in International Space Station (ISS). They did it in weightlessness, period. Watch the footage and be amazed at it.
By the way, this video was recorded in 3D. If you have the red-blue stereoscopic 3D vision glasses, you can watch in 3D here. Else, I think it is still fascinating to watch a few adults laughing so hard at a water bubble and a GoPro camera.
Just for the record, they are actually not playing but conducting some experiement.
NASA astronauts Steve Swanson and Reid Wiseman — along with European Space Agency astronaut Alexander Gerst — explored the phenomenon of water surface tension in microgravity on the International Space Station. The crew “submerged” a sealed GoPro camera into a floating ball of water the size of a softball and recorded the activity with a 3-D camera.