FD also has an effect on other projects. We just released not one, but two new device platforms for our software. There are other, interesting projects on the docket, but it's rare to get more than one day of interrupted work on them before getting another "ZOMG it's broken!" emails about the other projects.
Fireman Development (FD) - You are constantly in crisis mode and thus are only motivated to do something when someone sends you an email containing the words "CRITICAL". And yes, it has to be in all caps.