It's Like Riding a Bike ...

Potty'ing is a lot like riding a bike.  Once you've got it, you don't forget it.  At least, I thought so ...

This isn't how you use the potty.  But it is excusable because Carter doesn't know how to use it, yet ... 

... but that's inexcusable!  Andy's been using the "big potty" for decades now!  He should know you don't use it this way!!!