Hmmm, I just don't think I'm observant enough, or organised enough for that!!
I'd be like
"Ooooooh - he's going to peeeee - now where did I put the potty?? Hold it, hold it in little man! Nooooooooo!"
there would be pee everywhere!!

It's bad enough when Evie needs to pee and I've taken the potty to clean it and not put it back in the right place!