My favorite is Macbeth Act 1 Scene 1 Line 3 when one of the witches says "Come Grimalkin" to the cat, and the cat meows. Our sailboat was named for this cat.
There's a line if Julius Ceasar where JC is saying "what it is, Brutus..." and in HS English one of the black gals read it so well as "What It IS, Brutus!"
PS credit goes to tijkmo for starting the thread on Culture You Bassoon.... So, blame him!