Interesting. Talking about metaphoric memes, you might have noticed that pretty much every police and action show spends a lot of their time showing people with guns, and often flashlights too, exploring gloomy places.

There must be some academy for actors to learn how to dance from corner to corner holding the gun in the most sexy way.

Edit: is there some place with explanations of the signs patrols use? Like raising the fist in an angle to mean "stop".