Vernon Dursley: Fine day, Sunday. In my opinion, best day of the week. Why is that, Dudley?

Harry Potter: Because there’s no post on Sundays?

Vernon Dursley: Right you are, Harry! No post on Sunday. No blasted letters today! No, sir. Not one single bloody letter. Not one! No, sir, not one blasted, miserable… (gets hit with a letter flying out of the fireplace)

From Harry Potter and the Sorcerer’s Stone (2001)