This reminds of young master J Jnr (my lodger's son), who at age 4, thought it would be great fun to put the plug into the sink and then turn on the taps................. just before everyone was going out for the day......
Another time, the wee monster was found washing his hair in his bedroom .... having used a jug of water and the whole bottle of shampoo - the term *frothy* was a slight understatement.
J Jnr also liked to demonstrate his prowess at creating pretty patterns on the radiator in the bathroom (the one next to the toilet pan, if you get my drift)....