1/2 pint of Guinness stout (or dark beer)
1/2 oz of Hennessy Cognac (or Cognac)
1/2 oz of Bailey's Irish Cream (or Irish Cream)
Pour the Bailey's Irish cream into a shot glass. Add the Hennessy cognac brandy. Drop the shot glass into a half-pint of Guinness lager, and chug.