This is a video of a man repeatedly sticking a piece of white paper in front of the welding mask of another man who's about to work on some pipe. Basically, he's tricking the welder into thinking his torch isn't working. It's all fun and games until you get somebody to blind themselves staring at a torch with no eye protection. Why you would even do this to a person is beyond me, but I suspect it involves one man sleeping with another man's wife, but that's just a highly educated guess and clearly this welder is no stranger to laying pipe.
Keep going for the video.
Thanks to Jay, who agrees this is when you try welding a coworker's hand to a table.