Act 3, Scene 4: Malvolio
Malvolio appears before Olivia, who is expecting Cesario. Maria convinces her Malvolio is mad, so Olivia orders Maria to have Sir Toby look after Malvolio.
“O ho, do you come near me now? No worse man than Sir Toby to look to me! This concurs directly with the letter: she sends him on purpose, that I may appear stubborn to him.”