[Paris comes back dressed as Romeo]
PARIS: What are you standing there for? Let’s go. You better start sucking on an Altoid.
Altoids are a brand of mints sold in metal tins. Created by the London business Smith & Company in the late 18th century, they became part of the Chicago-based firm Callard & Bowser in the 19th century. Their advertising slogan is “The Original Celebrated Curiously Strong Mints”. They are less widely available in the UK than in the US, although Marks & Spencer has an almost identical product called Curiously Strong Mints.
Why Rory had to suck on a breath mint when Paris didn’t even kiss her, I don’t know. Paris is very keen on hygiene though, and perhaps she wasn’t convinced Rory was clean enough.
(There is an odd sort of logic to Paris taking over as Romeo, because in Romeo and Juliet, Juliet was meant to marry Count Paris).