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

Jack Black has waded into the "chicken jockey" discourse. At a screening of A Minecraft Movie over the weekend, the actor surprised fans by showing up in the theater and issuing a tongue-in-cheek warning against a viral trend that involves shouting at the screen and throwing popcorn in response to an Easter egg in the film.