Disclaimer: JK Rowling owns all the characters except Towelie who belongs to Trey Parker and Matt Stone. Please read Towelie at Hogwarts otherwise this may be confusing.
The scene…Harry, Ron, and Hermione have just discovered a petrified Mrs. Norris.
Harry: OMG! What happened to Mrs. Norris?
Hermione: Why is there water all over the floor?
Suddenly Towelie appears out of nowhere.
Towelie: This mess can be cleaned up with a towel. Everywhere you go in the wizarding world you should bring a towel.
Harry: Christ! I thought we had gotten rid of you.
Towelie: Wanna get high?
The scene… Inside the center of the Chamber of Secrets
Harry: GINNY! Why is there water all over?
Towelie appears.
Towelie: Whenever you enter the Chamber of Secrets be sure to bring a towel. You never know when you may need one.
Harry: For the love of God!
Towelie: Oh! The basilisk!!
Harry: And I thought you had problems before.
The scene…Inside Hagrid's hut
Fudge: And you will be taken to Azkaban for opening the Chamber of Secrets.
Towelie: Be sure to bring a towel. You never know if you may need one in prison.
Hagrid: Towelie, this is not a good time.
Hagrid proceeds to caress Towelie's back and cup his ass.
Towelie: I feel so violated. I have to go get high now.