The taller of the John Hancock Center's two antennas is 1,499 feet tall. It's the second-highest point in Chicago to the tippy top of the Willis Tower's highest antenna, and certainly isn't a place for the faint of heart. But from time to time, some brave souls have to climb up the Hancock's antenna to change out lightbulbs, conduct inspections and perform general maintenance. The above clip shows exactly what that looks like.
The video shows a couple of workers nonchalantly passing around a welding torch while more than a quarter of a mile off the ground. To put that into perspective, if you fell from that height, you'd plummet for about 17.5 seconds before becoming a part of the pavement (disregarding wind resistance, of course).
But physics seem to be the last thing that this pair of brave gents are concerned with. One man is even smoking a cigarette, which is more likely to kill him than his occupation.