Photo: Warner Bros What came first: the chicken jockey or the lava chicken? Either way, it’s serving up an obsession with A Minecraft Movie one way or another. Jack Black ’s song, “Steve’s Lava Chicken” has entered the UK top singles charts , peaking at no. 21 this week, up from no. 77 during its debut. Oh, you don’t know the “Lava Chicken” song? It’s crispy, juicy, and super spicy. It’s also the shortest song ever to chart on the UK Top Singles at 34 seconds long. “Lava Chicken” isn’t even the