Harry Potter star Emma Watson was on Letterman Wednesday night, and Dave brought up her accidental panty-flash during the monsoon at the U.K. premiere of Harry Potter and Philosopher’s Chamber of Half-Blood Prisoners (see the 7:15 mark in the video below). She gets charmingly flustered, calls it a “wardrobe malfunction” (which sounds way less annoying in a British accent), and ultimately says, “At least I’m wearing underwear,” which draws applause from the audience. But not from me. I usually boo women until they talk off their underwear. I’m tough but principled.