In act one, scene one, of Shakespeare's Othello, Iago and Roderigo call the senator Brabantio to his window by falsely claiming that Brabantio is being robbed. From the beginning of their exchange, then, Brabantio is in a foul mood. His mood only gets worse when Iago tells him that
I am one, sir, that comes to tell you your daughter
and the Moor are now making the beast with two backs.
In other words, he is telling Brabantio that his daughter Desdemona and the moor Othello are having sex. Brabantio reacts by calling his servants to
Strike on the tinder, ho!
Give me a taper! call up all my people!
This accident is not unlike my dream:
Belief of it oppresses me already.
Light, I say! light!
Moments later, he is outside his house with his servants carrying torches and asking for someone "to raise all my kindred.” We can tell how upset he is by his frantic speech, which jumps from one thought to the other.
Where didst thou see her? O unhappy girl!
With the Moor, say'st thou? Who would be a father!
How didst thou know 'twas she? O she deceives me
Past thought! What said she to you? Get more tapers:
When Roderigo tells him that Othello and Desdemona are probably married, he becomes furious, stating that it is a "treason of the blood." Brabantio calls for weapons and vows to stop and search every house for his once good friend.