This is not your father (most likely).
And THIS is...
I was first introduced to this wonderful ale this summer on a trip to Chicago with our awesome family friends. We were out for a long walking tour, 12 miles total for the day if memory serves, when we stopped for lunch at one of the park bistros. The meal itself would have been totally forgettable were it not for the company and the above delectable drink. No, this isn't a cocktail, but it is FAR superior to my other root beer concoction. Now I have to warn you, it is a little pricey (around $10 for a sixer), but for root beer and booze lovers it is worth every penny.
I highly, highly recommend.