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"Karen" is a slang term and meme archetype describing an entitled, middle-class white woman known for demanding to speak to the manager, harassing service workers, and weaponizing privilege against people of color[1]. The meme coalesced from multiple internet trends between 2014 and 2018, drawing on Black American internet culture's tradition of satirizing racial hostility through commonplace names[1]. By 2020, "Karen" had become one of the most recognizable character archetypes on the internet, fueled by viral videos of real-world confrontations and the COVID-19 pandemic's mask wars[7].

Math Lady, also called Confused Math Lady, is a reaction image and GIF featuring Brazilian actress Renata Sorrah as the villain Nazaré Tedesco from the 2004 telenovela *Senhora do Destino*. The image shows Sorrah with an intensely confused expression, often overlaid with floating mathematical equations, and is used to express bewilderment or overthinking. First used as a reaction GIF in 2013, it exploded internationally in 2016 after someone added math formulas to the screenshot, turning it into one of the most recognizable confusion memes on the internet.

Rickrolling is a bait-and-switch internet prank where someone tricks another person into clicking a disguised link that leads to Rick Astley's 1987 music video for "Never Gonna Give You Up." Born on 4chan's /v/ board in May 2007 as an evolution of an earlier prank called "duckrolling," the Rickroll became one of the longest-running jokes in internet history. The official YouTube video passed 1.5 billion views[2], driven by nearly two decades of people gleefully tricking each other.

Caturday is the internet tradition of posting cat images and LOLcat memes every Saturday. The practice started on 4chan's /b/ board around 2005, spread through communities like LiveJournal and I Can Has Cheezburger, and turned into a weekly internet ritual still observed across social media. The hashtag #Caturday trends on Twitter most weekends, with users sharing photos and memes of their cats[1].

"All Star" is a 1999 rock song by Smash Mouth that became one of the internet's most enduring memes after its prominent use in the 2001 animated film *Shrek*. The song's iconic opening line, "Somebody once told me," launched thousands of remixes, mashups, covers, and parodies across YouTube, Reddit, and beyond. Written as an anthem for outcasts by guitarist Greg Camp, the track found a second life online in the 2010s through creators like Neil Cicierega and Jon Sudano, and the band themselves leaned into the joke.

Pepe the Frog is a cartoon frog character created by artist Matt Furie for his 2005 comic *Boy's Club*, best known for his catchphrase "feels good man." After 4chan users turned Pepe into one of the internet's most versatile reaction images in 2008, the character exploded into mainstream culture before being co-opted by alt-right groups during the 2016 U.S. presidential election, leading the Anti-Defamation League to add him to its hate symbol database. Pepe's story is one of the most complex in meme history: an innocent stoner frog that became a political flashpoint, a legal battleground, and a global protest symbol.

Harambe was a 17-year-old western lowland gorilla shot and killed at the Cincinnati Zoo on May 28, 2016, after a three-year-old boy fell into his enclosure. The incident spawned one of the defining memes of 2016, mixing ironic tributes, mock-serious mourning, and the viral rallying cry "Dicks Out for Harambe" into a sprawling internet event that outlasted every thinkpiece written about it.

Cat on Roomba is a viral video meme featuring cats sitting or riding on Roomba robotic vacuum cleaners as they move around a room. The format took off in late 2008 when a YouTube video titled "Roomba Driver" showed a cat perched on a moving Roomba, and it became one of the defining cute animal video trends of the late 2000s internet[1]. The meme belongs to the broader "Cats Riding on X" genre, which expanded to include cats riding tortoises, dogs, and other unlikely vehicles.