Nothing is quite as irritating as a smoke alarm above your head blaring at 180db.

Theres always multiple alarms blairing at you, with no easy way to reach the one that got set off. Every alarm in my house goes off if one is triggered, and two of them are on vaulted ceilings.

Even better, the cafeteria burning lunch so badly it sets off the building file alarm system, causing 500 people to evacuate the building, and the fire department being called automaticially. That happened about 2 weeks after a new catering company took over. I don't think they have ever regained everyones trust completly after that one.