Confidence

Daffy notices a sign on a tree that reads "DUCK SEASON OPEN"
Daffy: "Devilishly clever..." (notices Elmer approching) "Uh,oh!" (runs off screen)
Elmer continues walking until he runs into Daffy (who is disguised as a rabbit).
Daffy: "What's up Doc? Having any luck on those ducks? It's duck season, you know!
Bugs then approches disguised as a duck.
Bugs: "Just a darn minute! Where do you get that "Duck Season" stuff?"
With a look of confidence, Daffy points offscreen.
Daffy: "Says so right over there on that sign, you're so smart."
The sign now reads "RABBIT SEASON OPEN".
Daffy: (still with a look of confidence) "You know what to do with that gun doc..."

Source: wiki on Rabbit Fire!