Place it after the failed line lands and before any reaction, then follow it with the original Long Brain Fart for a second hit or Fart With Reverb for a different finish, and use a Game Show Buzzer Sound Effect only after the joke has fully played out.
Over dit geluid
This clip plays a long brain fart back far more slowly than normal, stretching it to nearly 48 seconds of low, drawn-out noise. It feels deliberately awkward and silly, turning a brief crude gag into a joke that keeps going past the point anyone expects it to stop. That dragging pace makes confusion, a blank mind and spectacularly bad timing feel bigger, funnier and harder to ignore.