As told by an Inflight Crewmember:
I was working the red-eye flight from SEA to JFK back a couple of years ago. The boarding process went as usual and we departed on time to JFK. Shortly into the flight a Customer rang the call button. I went to see what they needed and they pointed out that water was leaking from the overhead bin. I checked the vents and the surrounding area and couldn’t find the source of the leak. I informed the Captain who told me to keep an eye on it and to let him know if it gets worse. About 20 minutes after I first cleaned up the leak it started again. Still, nobody on the Crew could find where the water was coming from.
After we finished our first service I noticed a man in that same overhead bin pour water into
a duffle bag. I asked him what he was doing and he happily replied with a big smile on his face that “they like water”. “Who likes water sir?” was my response. He then proceeded to take his duffle bag down and opened it to show me his bag full of live soft shell crabs fresh from Seattle.
I called the Captain to let him know about the crab situation we were having in the back of the plane. He informed me that a bag of crabs was not issue enough to divert but that he would sent out an ACARS so that they may be able to get a priority landing in case they started to smell, or worse; that they might get loose. I suggested to him that the duffle bag be placed in a plastic garbage bag and the crabs ride in the flight deck for the remainder of the flight, and that is just what we did.
We were given priority landing into JFK and upon blocking into the gate the very cheerful Customer was given back his bag of crabs. How he got them on the plane in the first place we will never know.