Gas cylinder welding fire. Looks like the guy was unharmed, except for perhaps some scorched eyebrows and the shame of eternal internet fame.
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Previously:
https://www.homemadetools.net/forum/...4612#post80241
https://www.homemadetools.net/forum/...4315#post79736
https://www.homemadetools.net/forum/...7085#post84989
https://www.homemadetools.net/forum/...3122#post98114
https://www.homemadetools.net/forum/...3413#post99029
https://www.homemadetools.net/forum/...3576#post99483
https://www.homemadetools.net/forum/...020#post100536