Gas cylinder welding fire. Looks like the guy was unharmed, except for perhaps some scorched eyebrows and the shame of eternal internet fame.
Previously:
Invisible methanol fire in 1981 Indy 500
Hair catches fire while soldering
Big Wind firefighting jet tank
Fire bomber plane puts out truck fire - GIF, photos, and video
Artisanal firewood spoof - video
Two-headed fire truck - photo
Fire chute escape concept - video
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