Oh. My. God. Murphy's stout is sooo good. I also love Guiness. Actually, I was discussing with a friend of mine that if I had to pick a single beer too drink for the rest of my life it would probably be Guiness. But I'm on a whiskey kick right now anyways.
There's a really bizarre cougar bar in my town that serves Murphy's in pitchers. It is the only place I've ever seen serve good stout in a pitcher.
Amaretto into any beer is indeed a "Dr. Pepper." You're supposed to chug it, but since it won't curdle, you don't really need to.
I prefer Irish Car Bombs ... Take a tall highball glass, half filled with Guiness. Drop in a shot glass, glass and all, of half and half Bailey's and Irish Whiskey. Drink fast. This one curdles. Tastes like awesome.