Other contributors have said "What is an example of a pun in act 4 of romeo and juilet?" is the same question as "What is an example of a pun in Romeo and Juliet act 3 or 4?" If you believe that these are not asking the same thing and should be answered differently, click here
What is an example of a pun in Romeo and Juliet act 3 or 4?
Romeo says that the flies are better off than he is because they can land on Juliet and he is not even allowed to see her. "Flies may do this but I from this must fly" he says. The pun is of course...