“As kid I liked the Hubba Bubba and all the cheap gum that we used to chew,” Melidosian said, adding that she while doesn’t buy as much gum as she once did, she rarely goes without.

In a gum-obsessed dystopia, the Looney Tunes’ new adventure, “The Day the Earth Blew Up,” doesn’t chalk up to all of its “Hubba Bubba.” ...