it's a mystery to me

after driving grandma to her acupuncture, we stopped at dairy queen for a quick treat on the way home.
g: "yay, we're going to dairy queen!!"
me: "i know! i'm so excited! what kind of blizzard are you getting?"
g: "i don't know. what kind are you getting?"
me: "i'm not sure either."
g: "let's just surprise ourselves."
me: "good idea."