My son, at the ripe age of 18 months, has found enormous humor in farts. I suppose it was inevitable but I was surprised to see him reach this point so soon. He farts, grins and shouts "I too'!" (I toot). If Mr. P farts (and mainly with him -- he doesn't seem to comment on the rest of us), he laughs and shouts "you too'!" in amazement.
He already flirts with women. He now just needs to learn to adjust himself in public and he's there.