I've had a variation of this drink which, in addition to the Guinness Stout and Bailey's, has an additional shot of Jameson Irish Whiskey in it. It should be noted that in this iteration, not only is the drink quite a bit more potent, the Whiskey should be added before the Bailey's in order to give you enough time to chug it.

This drink will put hair on your chest. Two will make you a real man. Three will make you unconsicous, and four will make you dead. :)