Hi here is a copper wire fuse. Watch the youtube video for more information and to see it in action
When the load becomes too strong the copper wire lights up and breaks.
There is a saying which goes: "If you cannot say anything nice, don't say anything at all".
However, I am going to ignore that piece of sage advice.
The camera work was shaky and out of focus.
There was very little technical/educational content in the video.
The commentator/cameraman/producer sounded as though he was on the very limit of his technical knowledge. (Was it you?)
If it was a 5 year old doing the presentation than it could have been interesting seeing the discovery of a young mind, but as it is, its the worst youtube video i have ever seen.