"In fact, though their acquaintance had been so short, they had guessed, as always happens between lovers, everything of any importance about each other in two seconds at the utmost, and it now remained only to fill in such unimportant details as what they were called; where they lived; and whether they were beggars or people of substance."

Next Quote

Sunglasses must be kept on until an acquaintance is identified at one of the tables, but one must not appear to be looking for company. Instead, the impression should be that one is heading into the cafe to make a phone call to one's titled Italian admirer, when--quelle surprise!--one sees a friend. The sunglasses can then be removed and the hair tossed while one is persuaded to sit down.

— Peter Mayle