Tybalt: You shall find me apt enough for that, sir. And you will give me occassion.
Mercutio: (walking away suggestively) Could you not take some occassion without giving?
All of the cute little allusions to Shakespeare's lines dotted here and there as ad slogans. The best one: "I'll send it posthaste!" In the movie, "Post-Haste" is a courier service, like FedEx (note the typeface).
The Montague boys leering and shouting 'I am a pretty piece of flesh'... at a group of nuns.