What happened when Maxwell took Mijbil to the bathroom? What did it do two days after that?

When Maxwell took Mijbil to the bathroom, it was plunging and rolling in the bathtub, shooting up and down the length of the bathtub underwater, and making enough slosh and splash for a hippo.

After two days, it escaped from the bedroom to the bathroom. By the time he got there, Mijbil was fumbling at the chromium taps with its paws and in less than a minute, it had turned the tap enough to produce some water and after some time, achieving full flow.