I suppose if there were a nuclear war, or asteroid hit we might have to deal with those last few minutes.
I hope that I would spend the time appreciating the life I've had. I would even like to live it again EXACTLY as before without any changes. Nietzsche called this "amor fati", loving your destiny.
Leave the cats at the neighbors with a note I had to leave town and please mind them till I got back.
keep all of us together and go in style knowing that I will meet those who have already passed over, oh and have a special swig of malt whisky and a Fag and hold hands as we go and regret nothing X
I'd kill them, just because it would be incredibly annoying to know you were going to die, and because i can't really get punished, break as many laws as I want, tell someone i love them, just because i'm too shy to do it normally, and say I'm leaving.
Then i'd go to sleep, listening to a song, and find out if and what happens after death.