I just had a little bit of excitement at the office.
Replacing the water filter on our cooler, I closed the valve I have always closed, but when I removed the filter, water came pouring out. Thankfully I have learned when dealing with plumbing items to always have a bowl handy. Checked the valve to make sure it was closed and looked for another. Finally got some help. There is now a new valve back below the sink, about 10 feet from the cooler, and the valve I was trying to use is not running water any more. I have no idea why they left it. but yeah don't tell the guy who handles the cooler that you have installed a new line.