Answer:
Take the first four words of any play you choose:
"Who's there? Nay, answer . . ."
"Two households, both alike . . ."
"Now is the winter . . ."
"In sooth I know . . ."
"If music be the . . ."
"Fair Hippolyta, our nuptual . . ."
"When shall we three . . ."
"I always thought the . . ."
"Oh, for a Muse . . ."
"Old John of Gaunt . . . "
are just a few of them.