I saw this yesterday night, and I thought everyone would be amused by it.
https://www.independent.co.uk/news/uk/home-news/schoolgirl-excalibur-king-arthur-lake-discover-dozmary-pool-cornwall-bodmin-moor-matilda-jones-a7930881.html
It would appear that a normal schoolgirl - one Matilda Jones of Doncaster - discovered an unexplained sword in Dozmary Pool on Bodmin Moor, which, according to legend, is where Arthur was granted Excalibur by the Lady of the Lake. The bad news is that, at the end, the father assumes that it must be an oldish film prop as the sword seems only 20-30 years old.
Still, it must be quite an exciting moment to find something so coincidentally like that. Fantasy fans can only wish they could be so lucky.
In contrast, an 8 year old named Saga in Sweden found an authentic viking sword in a lake. Here's an article: https://www.elle.com/culture/career-politics/a23937526/girl-pulls-sword-lake-sweden/