I found that whenever a 100W light-bulb went in my flat, it also blew the main fuse.
So I tried 60W - but when the first one blew, the same thing happened.
So I've decided to go back to 100W.
Readers: What part of "interesting" is it you don't understand?
The picture is of the "pioneer" or "pilot" bore for the Eisenhower Memorial Bore in Colorado
Readers: Spare us.