When is pun used in Romeo and Juliet?

Answer 1

The play is full of puns, usually dirty ones. The play starts out with Sampson and Gregory punning

Sampson: Gregory, on my word, we'll not carry coals

Gregory: No, for then we shall be colliers.

Sampson: I mean, an we be in choler, we'll draw.

Gregory: Ay, while you live, draw your neck out of collar.

The puns here are on "collier" (which means a person who delivers coal), "choler" (which means anger) and "collar" (which means the same as it does nowadays, although Gregory is probably thinking of a "hempen necktie", a noose)