Astronaut Scott Kelly is spending his free time on the International Space Station playing pingpong with a water droplet.

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Sources:
NASA
https://www.youtube.com/watch?v=GliZyspplDs
NASA
https://www.youtube.com/watch?v=TLbhrMCM4_0
NASA
https://www.youtube.com/watch?v=etUkR3FmDnw
NASA
https://www.youtube.com/watch?v=AmS20epgSOY

Image via: NASA
https://www.youtube.com/watch?v=TLbhrMCM4_0