CAUTION...BAD PUN AHEAD:
At the San Francisco Zoo there was a exhibit of dolphins in a large pool. Sad to say, they were not shy about showing affection for one another. Complaints were filed. Zookeepers were informed that raw seagull meat would sublimate these urges. It worked. There are lot of gulls in the S.F. area, so...
Problem was, to get to the dolphins it was a long walk around the lion exhibit and occasionally, after lions were fed and sleepy, zookeepers would make a short cut thru the lion's den... safely, over and around the lions.
It was a shock when the FBI showed up one day and arrested some of the zoo keepers and hauled them away.
It was stated that the violation came under the ...1937 Mann Act: Crossing a staid lion...with a gull...for immoral porpoises.