Give an Irishman lager for a month, and he's a dead man. An Irishman is lined with copper, and the beer… — Mark Twain

Give an Irishman lager for a month, and he's a dead man. An Irishman is lined with copper, and the beer corrodes it. But whiskey polishes the copper and is the saving of him, sir.

Source: Wikiquote · CC BY-SA 4.0