"This was your doing!" she exclaimed.
"Now, Aunt Petunia, how can you say that?" Harry replied sincerely. "I've been locked up in my room all night, and you only just released me."
"Well….well….erm….Oh!….Oh!…Oh!"
This time there was some movement behind her shrieks, as she strode out of the bathroom to question her son about the urine stains.
"Dudley?" she called out from the hallway.
There was no answer.
After three attempts she decided that her son couldn't hear her over his music. Finding the door handle unlocked, she tried to open it, only to find her entrance impeded by a damp towel that had been stretched along the door's bottom edge. This only got her madder, so she shouldered open the door and burst inside.
A purple haze wafted back out into the hallway, carrying with it the shrieks of both his Aunt and cousin.
Brimming with anticipation, Harry rushed out into the hallway and poked his head inside Dudley's room. He wasn't disappointed… Aunt Petunia had walked in on Dudley wanking off in bed, with a lit joint in his mouth and a porno DVD playing on one of his televisions.
"Triple bonus points on this prank!" Harry decided. With a broad smile on his face, Harry walked downstairs, put the teapot on the fire, and sat back to enjoy the show.