You say “psssssssssss”. LOL
And no, that doesn’t mean you actually pee on it.
Here is the process…
1 – Diapee off
2 – sit down
3 – say “psssssssssssssssss”
4 – smile at mommy while mommy laughs out loud
5 – look in potty
6 – see nothing there
7 – say “pssssssssssss” again
8 – get up
All done!