@Popehat Ooh! I actually know a Mann Act joke! Let me find a version that will fit the toot size limit...

A zookeeper fed his long-lived dolphins baby sea gulls, which was the secret to their longevity. One night he was was carrying the gull chicks, but he had to jump over a sleeping lion, and so he was arrested for transporting young gulls across sedate lions for immortal porpoises