JonTron, the YouTube comedy reviewer played by Jon Jafari, built a following by reacting to infomercials, games and internet oddities with exaggerated delivery. Flex Tape came from the Flex Seal line of repair products, whose loud television demonstrations and claims of stopping leaks instantly turned into a widespread meme. Short reaction clips from JonTron's take on that hype now circulate on soundboards and in edits, where the joke is less about the tape itself and more about selling an ordinary fix as if it were a miracle.