A lot of Marvel fans have been complaining that the upcoming "Avengers" sequel, "Age of Ultron," has been pushing too dark of a tone. Aren't these things supposed to be fun? Well here's a solution: Have some rambunctious kids redo the dialogue and sound effects, like in this "Kids Lip Dub" video from the Watercooler. It's absolutely adorable. And I'll just say this: The whooshes and sound effects will melt your heart.

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