The old man and the frog.

An old man is walking down the street one day when he hears a voice.

"Excuse me, sir."

The old man looks around, but there's nobody nearby, so he continues walking. He doesn't make it another step when he hears the voice again.

"Down here."

The man stops, and looks down at the ground where a frog is sitting casually. The old man looks around again, just to make sure there's nobody to witness him actually trying to talk to a frog, and says, "That can't have been you."

"Yes sir, it was," said the frog. "I'm not really a frog though. I'm actually a young, beautiful princess who was cursed into this form. If you kiss me, I will revert back to my human self and will grant you the wildest night of sex you've ever had."

The old man ponders this for a moment, looks left, looks right, then bends down, picks up the frog, puts it in his pocket, and continues on his way.

A muffled voice comes from his pocket saying, "Wait! Didn't you hear what I said?"

The old man replies, "Oh, I heard you just fine. At my age though, I think I'd rather have a talking frog."