Place it immediately after the slow segment, at the point where the audience expects a payoff. Follow it with the SpongeBob sad song to close the scene, keeping the edit short and letting the second clip carry the ending.
About this sound
This very short clip captures Homer Simpson giving a flat, uninterested reaction, his familiar cartoon voice sounding weary and unimpressed. It gives listeners a quick, dry laugh at dullness itself, turning a slow or disappointing moment into a shared joke. The reaction comes from The Simpsons, where Homer's bored delivery has become a familiar shorthand for disinterest.