Not a horror story but once while sitting right at the back of a rather small local airline flight I found a pair of grimy white plastic jerry cans that had come loose from under my seat and were sliding around. I flagged a flight attendant down and was told they would ask the pilots. Later they told me they usually contained coffee! I was suprised that as the flight attendant they didn't know that but given the plane was so small maybe they were new to the job.