Throw in the Bailey's and make it an Irish Car Bomb*.BTW, if you don't like Guinness, give it another go with a different twist. After the pint has settled, slow-pour in a double shot of Jameson's. It will mix itself; I call it the "Lava Lamp" because it sort of looks like one as it mixes.
*Hello, Boris. **
** if you don't get this Cold War, BB reference, pm me if interested.