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Anything cold, creamy, and sweet has oodles more appeal when it's hot outside. Not that we really need an excuse for ice cream any time of year, but ... neither do we need a logical reason for a milkshake. Milkshakes are easy to make using ice cream you already have. And that box of funfetti cake mix isn't limited to just cake either. Don't be fooled by the name. Cake can become a milkshake too. Oh, yeah. You cannot forget the rainbow sprinkles. If you're going to go all festive, include the edible confetti.