The letter E became a running joke across meme pages and short-form video, where single letters are treated as punchlines for no reason at all. Clips like this one circulate on soundboards because they are endlessly reusable: the sound carries no meaning, so editors can attach it to any failed plan, awkward pause or deadpan stare. Its staying power comes from that blankness, the same reason creators reach for a vine boom sound when a joke needs weight, except here the joke is that nothing happens at all.