Young Harry Potter Learns to Go Potty

How was it that young Harry, orphaned after the murder of his parents by Voldemort, learned to go potty? Well, one day professor Lupin visited young Harry and gave him his first potty lesson, as follows:

Prof. Lupin: Now, young Harry, I want you to clear your mind and think of your happiest memory. Got it?

Harry: Yeah.

Prof. Lupin: Okay, good. Now, Harry... Wand at the ready!