While ferrying workers back and forth  from our offshore oil rig, the helicopter where I was lost power and went  down.  Fortunately, it landed safely in the lake. Struggling to get out, one  man tore off his seat belt, inflated his life vest,  and jerked open  the exit door.  

"Don't jump!" the pilot yelled. "This thing is supposed to float!"  

As the man leapt from the  helicopter into the lake, he yelled back, "Yeah, and it's supposed to FLY too!"