Black Jack the goat spent his time in the wings, learning the tricks of the late, great Jumpy. Where did Jumpy learn? Some say he was highly food-motivated. Some say he trained himself. Some say he was abducted by aliens and came back a changed goat (no one actually says that). Now Black Jack has stepped into Jumpy’s hooves and carries on the proud tradition, which begs the question: was Jumpy murdered so that Black Jack could get all of the fame and goat kibble he desired? No one’s asking that, either. Spotted on Washington 530 in Arlington at Foster’s Produce.