"Stick out your right hand over your broom," called Madam Hooch at the front, "and say 'Up!"
"I don't understand the point of making us do that." stated one of the muggleborns in confusion.
"For most people," explained Madame Hooch with a smile. "It allows a student's magic to interact with a broom for the first time to see if it will agree with it. Some people, although not many, will have adverse reactions, and so we know from the beginning before any flying is done, not to allow that student to continue."
"I didn't know that!" called several students in amazement.
"Up!" everyone shouted.
Harry's broom jumped into his hand at once, but it was one of the few that did. Hermione Granger's had simply rolled over on the ground, and Neville's hadn't moved at all. Perhaps brooms, like horses, could tell when you were afraid, thought Harry; there was a quaver in Neville's voice that said only too clearly that he wanted to keep his feet on the ground.
"I have never thought of it that way Mr. Potter," said Madame Hooch in a thoughtful voice. "Perhaps I should have some of the broom companies' research departments take a look at that and see if it is true."