memory is too poor

one farmer walked home from a market one day.on the way he feel that there is something he forgot to do but whatever he think, he could not remember what is the thing he forgot.
He get more and more worried on the way home. He stopped five times on the road to open he diary to see what he had forgotten to do but he found out he had done everythiny.

Before long, he reach home. His daughter come out to welcome him. The daughter looked sad spoke," father, where have u left mum ??? she is not back home!"

this is taken from a book