Obama sang 'Purple Rain' to a trick-or-treater dressed as Prince

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When you're a child trick-or-treating, all you're hoping for is some good candy.

When you're a child trick-or-treating at the White House, a little something extra would be nice.

One young trick-or-treater visiting the White House dressed as Prince scored not only sweet treats, but also a serenade by President Obama of "Purple Rain."

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The young Prince's uncle posted a video of the magical moment on Twitter.

The proud uncle also tweeted some photos of the young Prince and a unicorn at the White House.

The Prince costume is basically perfect. 

Image: masterwilliams/twitter