Once upon a time, telephone switchboards were in danger of catching on fire. New York Telephone Company held a fire-fighting exhibition (read:contest) in order to teach their workers how to put out fires. They gathered the watchmen in a Brooklyn backyard and gave them equipment to put out switchboard fires. The flames started small, but as the watchmen started to get the hang of it, they began putting out bigger and bigger fires.
New York Telephone Company really knows how to be productive while having fun. It seems really obvious-- the best way to teach people to fight fires in the workplace is to create one (in a semi-controlled environment.) No one does this anymore.
Read the full story in Learning to Fight a Switchboard Fire