In compiling this all-important ranking, we traveled back to the dawn of YouTube (2005!) and worked our way forward, amassing a daunting trove of links and whittling them down to the absolute best, funniest, most subversively "online" 100 videos. We largely avoided music videos, web series, tutorials, and sketch comedy, wells so deep they deserve separate rankings of their own. And with apologies to the TGIF theme song guy, we also stuck to bona fide YouTube hits.
As you scroll through the cavalcade of videos on this list, you'll encounter viral videos you definitely remember, viral videos you definitely forgot, selections that have aged like fine wines, and a few relics from less enlightened times that, on their own terms, still have merit. Not every viral video is great, and not every great video goes super-viral. We've almost certainly left off your personal favorite. At the end of the day, what makes a YouTube video great? Like most treasures online, you know it when you see it.