fred and george weasley on the top floor in hogwarts trying to get slinkies all the way down by predicting the pattern the stairs are gonna shift in
they actually figure it out, they calculate the exact pattern, and start distributing it
suddenly, students are barely ever late to classes any more and there are significantly fewer incidents of getting lost around the castle
everything goes wonderfully for a week, all the professors are baffled but pleased
until the end of the week when the true purpose for the pattern’s distribution becomes clear. schoolwide slinky race. a thousand conjured slinkies all let loose at the same time. the rustling of the swarm of springs echoes through the halls of hogwarts. the house elves refer to the dreaded Slinky Sunday for centuries