Harry Potter: Hey guys, what should we do today?
Hermione Granger: Go to the library?
Ron Weasley: Prank Ginny?
Harry Potter: That's a good idea. What's your idea, Peeves?
Peeves: We should prank Umbridge!
Harry Potter: Yes! I love pranking Umbridge after what she did to me!
Ron Weasley: Definitely! How about you, Hermione?
Hermione Granger: Depends on what kind of prank it is.
Harry Potter: You thought of the idea, Peeves. What kind of prank will it be?
Peeves: Put shaving cream in Umbridge's bathroom and closet!
Harry Potter: That's a great idea! Are you going to help us prank Umbridge, Hermione?
Hermione Granger: Yes!
Later in the day, while Umbridge leaves for work, Peeves sneaks into Umbridge's house and fills up the bathroom and all the closets in Umbridge's house with shaving cream
