I've seen The Philadelphia Story close to a dozen times, so it's funny that I don't remember the Stingers or Uncle Willy referring to them as "a formula that's said to pop the pennies off the eyelids of dead Irishmen." But I'll be looking out for this scene next time.  Maybe I'll even try stirring up this mint and brandy concoction, although it doesn't sound like a very appealing mix.