There’s a video blowing up on Facebook of a kid jumping up and down in front of a bear enclosure at the Nashville Zoo. And a bear on the other side of the glass starts doing it with him.
BERLIN - DECEMBER 05: Polar bear Knut is seen in his outdoor enclosure at the Berlin Zoo on December 5, 2008 in Berlin, Germany. The Berlin Zoo celebrates the 2nd birthday of the popular polar bear Knut. (Photo by Carsten Koall/Getty Images)