Well, then just remind your friend that he will drop dead one day and won't get up again.
There is also the other end of the road. Remind him of his own mortality and he will shut up.
Good night!
PS: I should fall on my bed right now, but for some reason I am still up.
PPS: I hope he won't then refer to something like this:
http://www.mountainsoftravelphotos.c...r%20Coffin.JPG