Compulsion - S1-E2
Corrected entry: When the professor gets killed, a kid is shown trying to drink out of the water fountain, but the water is turned off. Gideon figures out that there will be no water to the sprinklers, so a fire is soon going to be set. In real life, fire sprinklers are not connected to the main water supply. Sprinklers are on a separate pump. (00:15:00)
Correction: If the building's water main has been shut off the will be no water to either sprinklers or water fountains. A "typical" building has only one water main.
Correction: There are times when a building sprinkler system may be completely separate from the building water supply, but this isn't necessarily the case. The sprinkler system may tee off the water main. The interconnect valves would be secured and alarmed, but that wouldn't be impossible to circumvent.