As I mentioned many times before now during the construction of our new house I & mother live in quite temporary condition, in the small house I've lived for years and one room we hadn't pulled down with other part of the old house, and one of the locks is just a small, makeshift one which we can set without the key. Today my mother was going to go out in haste, left her keys, purse and everything in the old room and locked that room from outside!
It's quite fortunate that she had the phone at hand then, that the number of my mobile was inputed in the phone, that I could take the phone call soon & not busy today, ...and that my office is just 15 minutes from home by car!
I took a taxi and went home, opened the door with my key. Mother was waiting for me in front of the house ... it's also fortunate it's a fine day today and she had put on her coat. Then I again took a taxi to back to the office. The whole matter took just 30 minutes and nobody seemed to notice my absence from the office.
Well... today the matter was not serious but this could happen again anytime so ...I thought that we should keep the duplicate key somewhere in the garden. XD