A cigarette lighter designed to look like something else, such as a toy or gun.
In fiction, there will invariably be an actual
toy or gun that looks exactly like it, causing a character to mix the two up. Hilarity Ensues
In real life, some cities and states have actually banned the marketing and sale of novelty lighters in their jurasdictions, because their resemblance to ordinary toys may present a greater risk of fire or injury.