Joe Glow, the Firefly

Joe Glow, the Firefly is a 1941 Warner Bros. "Looney Tunes" cartoon directed by Chuck Jones. The short was released on March 8, 1941.
Plot.
A firefly enters a tent where a man is sleeping. The firefly slips and slides all over the man's face and then investigates the food in the tent. Having looked everything over, the firefly shouts a single word into the man's ear.