If you don't have humour, then you may as well nail the coffin lid down now.

the final nail in any would-be star's coffin.

That goal was the nail-in-the-coffin.

Everybody seems to live rather well down here in Monaco!

Marriage is like a coffin and each kid is like another nail.

You may lose by it now and then, but it will be a loss well gained if you do.