Josh Harrison hit a walk-off Little League homer, then did an interview with ice cubes on his head

The Pirates were up 2-1 from the fourth inning on during their game against the Brewers on Tuesday. Then, in the top of the ninth inning, Hernán Pérez knocked in Ryan Braun with a single to tie the game at 2. Would fans go home unhappy? Would it be sad times in Pittsburgh? Was the rabbit somehow involved?
We're not sure about that last question, but the first two were answered by Josh Harrison's walk-off, Little League homer in the bottom half of the inning:

Even more impressive? Harrison did nearly his entire postgame interview with ice cubes resting atop his head.