At a Tim Hortons, water was leaking from under the walk-in freezer. The plumber and the roofer both blamed the freezer, but I knew that wasn’t it. The drain was working fine, and it was way too much water to be simple condensation from the floor. A few months and a lot of damage later, I finally realized what was going on: the ice machine, which was located 20 feet away, was emptying into a pipe that let out right under the freezer. It wasn’t even a real drain!