Oliver: I have to pee pee!

Rachel (in the shower):  You can use the little potty under the sink.  Use the little blue (Bjorn) potty.  It’s under the sink.

– a few moments pass –

Oliver:  I like to pee in the sink!

Rachel peeks out of shower, sees Oliver has climbed onto counter, is scooted up to the sink and, I assume, has just finished urinating into it.)  Oliver!  We don’t pee in the sink!  The potty is UNDER the sink.

Oliver:  (Gets it now.) Oh.  (Smiles enthusiastically) I like to pee in the sink!  (Thoughtfully) Need to wash my feet now.