It should be noted that the best way to quaff this is in the middle of a group of
screaming drunk people (who will give you the necessary
courage), and that it's considered improper to pour the
shot into the
stout.
What you do is drop a shot glass of Bailey's Irish Cream in the pint, and then chug immediately afterward. You will burp. This drink will put hair on your chest. Women will find you more attractive. You will wake up smiling despite your hangover.
It should also be noted that this is the type of drink that only leads to more drinks, sort of a "everything else pales before what I just did" type of thing.
I've also heard this referred to as a Belfast Car Bomb. Your local terminology may vary.
Back to the Bartender.