Released in 2004, the cult classic 'Mean Girls' features a pivotal scene where Regina George (Rachel McAdams) confronts Cady Heron (Lindsay Lohan) about her casual attire. Accompanied by Gretchen Wieners (Lacey Chabert) and Karen Smith (Amanda Seyfried), the Plastics enforce their strict fashion laws with cold precision. Regina dismissively tells Cady, 'You're wearing sweats. It's Monday,' effectively banishing her from the lunch table for the day. This clip is a cornerstone of internet culture, used to satirically judge others for failing to meet specific social standards or arbitrary rules. It perfectly captures feelings of elitism, exclusion, and the humor found in rigid social hierarchies. Users often deploy it to call out friends who aren't following 'the vibe' of a group or event. Example captions include: 'When the group chat has a theme and you missed the memo,' 'Me judging my friends who still use light mode,' and 'When you show up to a black-tie event in sneakers.'