Not clear on the concept

So, last night it was bath night. (I don't know how parents bathe their children every day. Aidan gets so wound up by bath time that I have to bathe her before dinner so she has time to wind down enough to go to sleep - not to mention that it makes dinner late and everything else late, but, I digress.) We were in the bathroom getting ready and Aidan wanted to sit on her potty. So, I get her undressed and put her on the potty. She sits a minute and then wants off. I pick her up and she pees on my shoe. It was just a little bit, so I put her back on the potty. Nothing. She wants off. Pick her up (no shoe peeing) and put her in the bathtub. She stands there and pees. I said, "You are supposed to do that in the potty, silly." Other bath time fun included putting her whole face in the water and blowing bubbles. Who needs swimming lessons? The child is a natural!