Lydia, three years old, informed me that this is NOT called a soap dish.  It is a soap bench.

You can see her point.

Immediately after this pronouncement, she stood up and started dancing.

MAMA: Don’t dance in the bathtub.  It’s slippery.

LYDIA: I am just showing you how horses dance. (slips a little; casually rests her hand on the cold-water knob for stability)

MAMA: Horses don’t dance in the bathtub.  Too slippery.

LYDIA: Do horses not like slipping?

MAMA: Horses are very afraid of slipping.  If a horse falls down, often it can’t get up again.  Horses are strangely fragile that way.

(Lydia looks worried, sits down, and starts playing with cups.  She waits until she is out of the bath and out of the bathroom to show me again how horses dance.)

I’m glad that worked!  We didn’t have to get into a big power struggle about sitting down in the bathtub.  The susceptibility of horses to irrepairable breakage when they fall is one of the more disturbing things I’ve learned about life here on Earth, but in this situation it was useful to know!