This may sound pretty strange, but you really should give it a try. The roasted barley gives it a coffee flavor, and the hops add a little bite in the finish.
List of Ingredients
2 cups of vanilla ice cream
1/2 cup milk
1/2 cup Guinness Extra Stout
Recipe
Put all the ingredients in a blender and mix to desired consistency. I've also heard of people making Guinness ice cream floats.