The Big at School 12 phenomenon may have originated in 2011, but its legacy continues to be felt today. Many of the fashion trends, musical genres, and entertainment formats that emerged during this era continue to influence popular culture.
Knowing the country or medium (e.g., a DVD title or a specific magazine) would help narrow this down. The Use of Social Media in Children and Adolescents - PMC
2011 was the year of "planking," where students and celebrities posted photos of themselves lying flat in unusual locations.