Harry watched, fascinated, as Fred pulled a slip of parchment out of his pocket bearing the words Fred Weasley — Hogwarts. Fred walked right up to the edge of the line and stood there, rocking on his toes like a diver preparing for a fifty-foot drop. Then, with the eyes of every person in the entrance hall upon him, he took a great breath and stepped over the line.
For a split second Harry thought it had worked — George certainly thought so, for he let out a yell of triumph and leapt after Fred — but next moment, there was a loud sizzling sound, and both twins were hurled out of the golden circle as though they had been thrown by an invisible shot-putter. They landed painfully, ten feet away on the cold stone floor, and to add insult to injury, there was a loud popping noise, and both of them sprouted identical long white beards.