Call the attendant, ask him to return to the upright position, tack the chair and make annoying noises..... A lot of ways you can do it. That's something you can do, that is not that bad. Imagine sitting next to this guy.
Recline the chair in front of the fat man so he is trapped, and whisper in his ears something to the effect of we are all going to die, we are crash landing, or just AAAaaaaaaaaaaaaaah~~~~~~~