What's in the picture
The illustration used for this article shows a dog and a tiger at the edge of a round watering trough or pool of water. The dog, on the left, dark brown with pointed ears, looks at the animal, while the tiger on the right rests its paws on the edge and reaches toward the water. The background consists of wooden structures and enclosure fencing.
The picture is a photograph of animals, not a still from the flash-mob. The connection to the topic comes from the article's title and the format's mechanics: the meme's structure is built on the contrast between a calm opening and sudden chaos, neither of which is present in the shot. So the image should be taken as an illustration of the general theme of fun rather than as a document of the trend.
Origin
The basis for the flash-mob was the track "Harlem Shake" by producer Baauer, released in 2012. The track is built on a distinctive beat and a short vocal sample, which made it convenient for short clips. The name refers to the New York City neighborhood of the same name and its street culture, though the 2013 flash-mob drew on the ready-made format rather than any historical choreography.
The format began spreading in early February 2013 after the first videos were posted on YouTube. The video that set the template and is most often cited in reference materials is linked to a specific creator, though confirming his priority unambiguously is difficult: in that period similar videos appeared almost simultaneously in different countries. The author of all the earliest versions can't be established, so the details of the trend's origin remain unsettled.
How the format works
A typical video consists of two parts. In the first fifteen seconds, one participant dances in the center of the frame while everyone else calmly goes about their business: reading, eating, or working at a computer. This part sets up a comic contrast, since the viewer sees that no one is paying attention to the strange person.
When the main beat drops, the whole group appears in frame wearing ridiculous costumes, masks, or helmets, moving chaotically. The point is the sharp shift from the mundane to madness. Participants included offices, sports teams, school classes, military units, and students, with each new video trying to outdo the previous one in absurdity.
Scale and spread
Over a few weeks in February 2013, thousands of videos appeared, and the trend spread beyond the English-speaking internet. In Russia and other countries, schools, companies, and student groups copied it, filming their own versions. Baauer's track topped the UK singles chart, a rare example of an internet meme directly affecting the music charts.
The flash-mob quickly became a subject of media discussion, with some seeing it as an example of collective fun and others as an instance of shallow fad behavior. Interest faded by spring, but the format itself remained part of cultural memory: "Harlem Shake" is still remembered as one of the first mass internet trends of the social-media era.
Why the meme works
The meme's main mechanism is surprise. The contrast between the sleepy opening and the sudden explosion creates tension that releases as laughter. This rhythm is easy to reproduce and understandable without explanation, which is why clips could be filmed at home in a couple of minutes.
Collectiveness also played a role: participants showed they were willing to look silly together, and that brought people closer. The flash-mob was a shared gesture rather than a contest of individuals, which explains its mass scale and the speed with which it was copied across all kinds of groups.