I've only seen two like that.
One was over Richmond Hill in SW London. It was massive and pretty low. We all thought it was a jet contrail until it went "krackbang".
The other was about a year ago and in daylight. It was quite small came down about 1/2 a klick away. It looked like a welder's torch, left a little trail of debris and went "ssszzzzztttsizzlepop".
I'd have gone to look for it but the paddock was full of steers who looked 'iffy'.
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