The Great Thunderstorm of Widecombe

The popular version goes like this: during a terrible thunderstorm, the Devil himself appeared at Widecombe church, causing panic among the congregation. Lightning struck the church tower, people were killed or struck down, and the Devil vanished. It is told as a vivid, near-contemporary account of a supernatural visitation.

What we actually know is murkier. There really was a severe storm at Widecombe in 1638, recorded in a pamphlet called 'A True Relation'. But the pamphlet is a printed account of a local event, not an eyewitness manuscript, and the Devil's actual involvement depends on which version you read and how seriously you take seventeenth-century storm commentary. The tale has mutated considerably since then (legends are like memes in slow motion). Modern retellings often add details and dramatise the supernatural elements more heavily than the original source seems to support.

If you want to go and look for yourself, the 1638 pamphlet is in the public domain. Beyond that, the written trail gets thinner, and quite a lot of what circulates online now is embellishment rather than tradition.