We rent a house to some vets. They called and siad that one of their lights had stopped working and could I do something about it?
I have just been round. I examined the light and it certainly wasn't working. I removed the bulb and shook it. It tinkled a bit. Broken.
I replaced the bulb. The light worked.
Vet#1 said, "Is that all it was?"
These guys have 15 A levels and 24 years of University education between them!