What is your story of someone doing something really stupid on a plane?

Well, one time, I was on a plane, and this guy yelled "I'VE GOT A BOMB!" I was sitting next to him and of course laughed. How outrageous is that idea? Bringing a bomb on a plane? He said that it was going to go off in less than 5 minutes, and I was already in stitches. When all of a sudden plane security came over and tackled him, pinning him to the ground. The flight attendants gave us all headphones and started the movie (Han, was not impressed). We had not yet taken off, so they escorted the guy off the plane, and I'm not sure what happened from there. For some reason, no one else thought it was funny as I did. Funny experience, though.