It comes in 3 flavors: cheese, barbeque and sour cream for P55 only. Best eaten with sundae or with mcflurry.
Why is shake-a-shake fries so memorable for me? Because my boyfie and I were first teased in McDonalds in Intramuros during our college days, we were just blockmates and friends then, and I didn't know how it started but he had a secret crush on me. Our guy friends teased us when he bought me a shake-a-shake fries and spaghetti and my girl friends gave way for him so he can sit beside me and I was red as tomato... Of course, we did not became together because of shake-shake fries, it took him almost a year before he got my YES! Hehehe!
Anyway, it's always fun eating the shake-a-shake fries. Just put powder flavor in a bag of fries and shake, shake, shake! Beware, let the flavor settle down first before peeking in the bag else you're going to inhale the powder and sneeze. Enjoy shaking!