Minecraft' star Jack Black delivers a personal message to moviegoers advising against joining in the viral, messy, popcorn-throwing 'chicken jockey' trend.

While fans have embraced the absurd performances from Jack Black and Jason Momoa, it's a split-second cameo featuring a baby zombie riding a chicken that's sending teen audiences into absolute chaos. The Chicken Jockey, a rare and obscure Minecraft mob, has become the unlikely center of a viral eruption.

"A Minecraft Movie" is a box office smash and kids are fascinated with chicken jockey. What is it? Movie theaters are getting frustrated. What we know.