Carnforth Greville: If I ever forget my lines in Shakespeare, I always say "Crouch we here awhile and lurk!" That seems to do the trick.
Molly: Why? What happens?
Carnforth Greville: Nothing, normally, but, you know, improvise a moment of intrigue, give you a chance to think of something, pick up a script.
Kenneth Branagh, "In the Bleak Midwinter"
And Shakespeare and Black Adder talking about Kenneth Branagh, here: