SAM AND THE FIREFLY, by P.D. Eastman. When Sam, the owl, teaches Gus, the firefly, to write words in the sky, cars crash, movies are free, and hot dogs are cold.
THE VERY LONELY FIREFLY by Eric Carle. The firefly buzzes off in search of companionship, but keeps following other lights by mistake--a candle, a flashlight, a lantern--and these in turn are all leading in the direction of a fireworks display. Finally, the lonely firefly finds the friends it is seeking--a dozen or more other fireflies (you child will love the surprise on the last page!)