Horror-film clips captioned Oh hell nah or yah no cut to a me leaving the location clip of someone sprinting away, and every video uses a different sound.
It's a full horror scene about a mom insisting nobody is in the basement, captioned That ain't your mom, and it takes its time getting to a toothy grin. Then it cuts to people sprinting, which only works because the build was so long. A lot of people say they just woke up from it.
Here the scares come one after another under Oh hell nahh: a figure at the window, a face at a door peephole, then Hulk and a sprinting guy for the punchline. Nothing lasts more than a couple of seconds, so there's always another beat coming. The audience joins in with its own lines, like then we lowk crack.
At 99 seconds this is the long one, and it never really shows what's in the dark. That's the whole trick: you're staring at shadows with yah no on screen until the sprint finally breaks it. Most of the audience here reacts in Spanish, mostly about those shadows.