A source labels this "A Mount Etna smoke ring", but at first I was totally skeptical; wouldn't the conditions have to be kind of ideal to "blow" a smoke ring? A volcano couldn't do that could it? Doesn't the image look manufactured?
Well, I couldn't find any new information about Mt. Etna's smoke rings... but it turns out
Etna has been blowing rings for quite some time.
Who knew?