A bit of background first: I work in a BSL3 lab. This type of lab is for working with highly infectious pathogens and as a result is very specifically designed. For example, all air in and out is filtered through Hepa filters and the rooms are negatively pressured so that if doors are opened outside air is sucked in. We do all work with infectious agents in specially designed cabinets that use air pressure to keep pathogens in and everything else out. Not surprisingly, this requires a lot of power and since it's so risky, we've got a back-up generator. Campus facilities and maintenance crews aren't allowed to touch anything without giving us a week's notice.
Last week the HVAC crew decided to shut down our air systems, regular power and back-up power without any warning. Fortunately nobody was working with any pathogens right then, but we raised heck to make it very clear that this was completely unacceptable. You would think they learned their lesson, but today it happened again. Once again, we were lucky that nobody had any pathogens open, but that type of move could have risked infecting our lab workers with some not so nice diseases.
I thought my normally mild-mannered boss was going to have a stroke or aneurysm when we left him to ream out a whole lot of people.