Okay okay okay, this is more funny than bad.
This guy, we'll call him Slacker McGee, or SM for short. He really doesn't do anything, and is the only one in the shop paid hourly. Pisses everyone off, but we have fun with it.
So SM is in bay 1. Bay 2 is a "communal" bay, anyone can use it if they get ******* with a wrong part or something. One day, I was over in bay 2, it's also where the grinder is. I had to turn to use the grinder, and didn't notice bay 2's air hose was resting on the wire wheel. After a bit of grinding, that hose pops a hole.
SM wasn't anywhere to be found, as is normal. So I sneak over, turn off his air at the wall, and swap the blown hose with his good hose. He comes back and goes to use his impact (which is attached to the now blown hose), and there's nothing. He turns it on, and there's a big ol' hole blowing out!
He gets all upset about it, grabs his hose and goes into the office to whine. He got a new one from parts, but he still had to change out the fittings. When he came back, I just said "it started leaking, so I shut off the air!"