Nearly all of the Harry Potter movies have scenes taking place in the loo. From Hermione’s frantic getaway from a rogue troll in “The Sorcerer’s Stone,” to the brewing of polyjuice potion in Moaning Myrtle’s bathroom sanctuary in “Chamber of Secrets.”

“Chamber” also hides the Basilisk monster within the pipes of Hogwarts, and the secret lair of Salazar Slytherin can be reached through a hidden passage behind the sinks.

But nothing compares to a good old-fashioned wizard’s duel in the sixth Harry Potter installment: “The Half-Blood Prince.” In this scene at YouTube, Harry confronts nemesis Malfoy for hexing a classmate, and the young wizards duke it out with wands and an untested secret spell Harry found in a mysterious potions book.