"Water Games!" is one of the Oobi shorts.
Oobi and Kako discover a lawn sprinkler outside. They find it fun to run around while the water splashes around them, but become puzzled when it stops running. When the water starts to run again, they resume playing, until it stops once again.
This continues until Oobi and Kako notice the hose delivering the water to the sprinkler. They decide to follow it, and they find Uma pretending to drive a car by turning the faucet handle like a steering wheel, unknowingly turning the sprinkler off and on again.