Things like fuel spills, lock-ins, lock-outs, trapped pets, EMS requests for extra manpower to move overweight patients, assisting police, malfunctioning elevators, suspected gas leaks, sparking electrical conduits, foul smells, insect problems, wild animals, and - increasingly - responding to automatic fire alarms which have not been confirmed by other means.
Every fire department reports a large number of "other" calls, which are too diverse to categorize. My favorite one was retrieving a toy remote control motorcycle, which had accidentally driven itself into a storm drain. A bent wire coat hanger did the job and a little boy's tears dried up instantly!
Just to put the minor alarm story into perspective, Paris' BSPP reports that around 80% of non-EMS responses are to non-fire situations.
Of course, some of these merit a full response or just a PS, which is a combined light pumper and ambulance, with five crew members. But a large number are handled by two firefighters with a small van like this one. They load whatever equipment they think they are likely to need, and head out. This leaves fire and EMS coverage at the home station only slightly diluted, with all fire, rescue and EMS units still available for serious business.
In Germany, many departments hve dedicted KLAF (minor alarm) trucks. These are already loaded up with useful and commonly needed equipment, including in some cases a CAFS installation for nuisance fires. They are also crewed by two or three people. Some are quite elaborate, based on Mercedes Vario chassis, and the focus is to carry increasing amounts of equipment to be able to deal with a wide variety of situations.
Added by Les Davis on 14 October 2013.