Prefect's Bathroom

"In one side of the room there are the stalls with toilets inside. Opposite the toilets there is a large, swimming pool-like tub with bath taps surrounding it. The bath taps all run differently-coloured water, bubbles, and foam. Looking at the tub, one would imagine it would take quite some time to fill, but it actually fills remarkably fast, considering its size. Under the bathroom there are sewers that can be entered by blasting one section of the wall. " - Harry Potter Wiki.

So? What are you going to do. Just stand there? Take A Nice Looonnnngggg Bath, go on. Just make sure moaning myrtle isn't near by...