Quote from : Harry Potter and the Sorcerer's Stone Book

Oh, are you doing magic? Let’s see it, then.” She sat down. Ron looked taken aback. “Er — all right.” He cleared his throat. He waved his wand, but nothing happened. Scabbers stayed gray and fast asleep. “Are you sure that’s a real spell?” said the girl. “Well, it’s not very good, is it? I’ve tried a few simple spells just for practice and it’s all worked for me. I’ve learned all our course books by heart, of course.