Sia surprised shoppers at Walmart and T.J. Maxx on the Wednesday before Thanksgiving by paying for their items at the cash register, happily swiping her credit, posing for photos and giving out hugs.

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An 11-year-old boy singing in a Walmart has become this next viral trend and inescapable hit, thanks to celebrity endorsements and remixes. Somehow, this kid is being credited with bringing back ...