To see a favourite customer looking so very fragile.
This man has always been thin, but he came into the shop today looking as if a breeze could blow him over.
Now, normally, he comes in, smiling and happy to talk as I process his mountain of cat food and kitty litter, some frozen meals for himself.
He hasn't been in for a while.
Today, he shuffled in so very slowly, walking so very carefully, as if his legs might break at any step.
His face is sunken and has taken on the yellowish colour of the terminally ill.
Today, he bought only a few packets of dry cat food, nothing at all for himself to eat.
He confided that he'd just come out of hospital again and this episode had been bad.
I'm afraid that my friend is dying.