I once had to give flea baths to five cats. I put two inches of warm water in the bath tub and did each cat in turn. Four of them hated it and protested in various ways but the fifth cat once she got in thought it was fun to walk around the tub splashing the walls and playing with the water. I gave her a small ball to play with in there as well and she chased it around like mad. Next night I was woken up by a strange noise. She'd found a large wooden bead and knocked it into the tub and was chasing it around again.