I was sitting in my office, waiting for my nails to dry, um...working hard, and I heard talk of wands and Witches! I am a little biased because I love this under-rated show.
'Dope and Faith', from the 3 season, focuses on the hapless Stan, who prays to God that he'll soon find a true friend. When he does, there's a catch; his new best friend doesn't believe in God! The subplot focuses on Roger tricking Steve into believing a meth lab is secretly Hogwarts School of Magic!!!
If you haven't seen it, here is the episode on Amazon. Enjoy!