In sunnyvale, a city in Silicon Valley, police officers sometimes transform into firefighters before your eyes. All public-safety officers are trained as both cops and firefighters. Cops may arrive at an incident as a police officer and realise that a firefighter is needed instead. So they strip down to their underpants (sometimes in the middle of the street), and jump into the fire kit stored in the boot of their patrol car. When they are done, they change back into their police uniform.
Source : Economist
