 You spray the ceiling to sort of saturate the popcorn, and then you take a wide spackle blade, like as wide as one you can find, and you sort of gently start peeling away at the popcorn ceiling, at the popcorn texture, I should say, from the ceiling. And that generally does a pretty good job, because if you've ever tried to paint it, if you don't have the right roller when it gets wet...