Tasting notes: We were nervous about this one going in. Guinness is one of our favorite beers, and it'd be a shame to ruin a perfectly good pint. We were greeted with a little taste of smokiness and a lot of sweet, which made us feel like we were doing an Irish Car Bomb with peppermint schnapps instead of Baileys.
Verdict: Way better than we expected. We'll score this 3 out of 4-leaf clovers.
Don't just spike your Shamrock Shake with Irish booze, spike all your milkshakes with your nectar of choice from the Emerald Isle. You can't go wrong.
Lee Breslouer writes about food and drink for Thrillist, and thinks it'd be cool if McDonald's made the Shamrock Shake with real shamrocks. Follow him @LeeBreslouer, because you can't make up a name that good.