Well and what's cheese? Corpse of milk

A corpse is meat gone bad. Well and what's cheese? Corpse of milk.

Cheese is milk's leap toward immortality.

...‘All this suffering,’ I said, ‘and nothing but greed and violence to build on when the war is over.’
‘Have another soda-mint,’ said Charles.
I had one. Then I said, ‘Why are we here? That’s what I don’t understand. Why be here at all when it all has to be so beastly?’
‘I suppose we just came, like mould on cheese.’
‘Then why do we want to be happy? Mould on cheese doesn’t want to be happy.’ ...

But a little milk, butter and cheese are acceptable because no harm is done in obtaining them.

Corpse Bride.