We had a little server room where the AC was mounted directly over the rack. I don't think we ever put an umbrella in there but it sure made everyone nervous the drain pipe would clog.

Much more recently, I worked at a medium-large SaaS company but if you listened to my coworkers you'd think we were Google (there is a point where optimism starts being delusion, and a couple of my coworkers were past it.)

Then one day I found the telemetry pages for Wikipedia. I am hoping some of those charts were per hour not per second, otherwise they are dealing with mind numbing amounts of traffic.