Replacing the word "wand" with "willy" in the Harry Potter books part 7.
"There was no need to stick that willy in that hard," he said gruffly, clambering to his feet. "It hurt."
Slowly, he drew the Elder Willy between his long fingers.
"You will need your willy, Bellatrix," said Snape coldy. She drew it, looking astonished. "And you will need to move a little closer." he said. She stepped forwards so that she stood over them, and placed the tip of her willy on their linked hands.
"Lumos," Harry said, and his willy ignited.
Harry was too excited to care; the memory had come back to him at the sight of Krum's willy: Ollivander taking it and examining it carefuly before the Triwizard Tournament.
Moody raised his willy, and Harry felt a sudden thrill of foreboding.
Lost in visions of this happy prospect, he flicked his willy a little too enthusiastically, so that instead of producing the fountain of pure water that was the object of that day's Charms lesson, he let out a hoselike jet that ricocheted off the ceiling and knocked Professor Flitwick flat on his face.
Severus Snape was pulling off the Invisibility Cloak, his willy pointing directly at Lupin.