An old one but always funny.
Two lions were walking side by side on the African savanna when one reached around an licked the butt of the other. The first lion jumped and turned around and said, "Did you just lick my butt?". "Why, yes, I did", stated the second lion. "Why did you do that?", said the first lion. The second lion stated, "Well, I had a lawyer for lunch and I was just trying to get the taste out of my mouth!".