Imperial produced a smattering of Godzilla items, both during the time of GODZILLA 1985, as well as through the 1990's. The "Spark-E-Godzilla" was a toy that did just what it said: you revved it up, like a toy car with a "friction motor," and sparks shot out of his mouth. Sparking toys were not uncommon in the mid-1980's and the prior decades--I recall having a toy gun from the circus that was in the shape of a cannon. When you revved it up, copious amounts of long sparks shot forth from the opening. Even as a child, I wondered why this was okay.
At some point, parents and watchdog groups became nervous about children's toys that could potentially destroy any home with a gas leak, and items like this slowly disappeared, at least from toy aisles that were geared toward small children. (A quick search of Amazon yields only two sparking toys; one is a party favor, and the other, a sparking "Futurama" gun. A similar search at ToysRUs yielded nothing, but their site was acting wonky.)