Because Pirelli was going to blackmail him. Adolfo Pirelli is not the character's real name. He pretends to be Italian, but his real name is Daniel O'Higgens (the actor who plays him is Sacha Baron Cohen, better known as Borat).
When he was a young boy, who was still going by the name Daniel O'Higgens, he worked as Sweeney Todd's apprentice (back when Sweeney Todd was still going by the name Benjamin Barker).
Pirelli/O'Higgens recognized Sweeney, and threatened to tell everyone that he was really the escaped convict, Benjamin Barker...unless Sweeney paid him, and continued to pay him, for his silence.
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He is Judge Turpin(the bad guy) in the film Sweeney Todd.
Sweeney Todd is a Horror/Musical. It is rated r.
No.
His shaving razors.
Jayne Weisner plays Johanna in the 2007 remake of Sweeney Todd: The Demon Barber of Fleet Street.