Remember that advertisement for stout which said there was nothing like a Guinness, except another?

Devotees of the black stuff have no difficulty with this, although the philosophy has yet to penetrate certain cultural barriers.

News of the following conversation in a bar has reached the Margin.

Dubliner: "Luigi, will you have a pint?"

Italian: "No thank you. It's OK. I had one already."

Those guide books clearly ain't good enough.