Place this clip just before the closing beat of a reaction sequence, after the visual reveal has already played. Follow it with the Homer Ta Gueule button when the scene shifts from a gross-out moment to an argument, so the exchange ends on that retort.
About this sound
This 1.5-second clip is Ned Flanders speaking French, repeating three escalating words for disgusting: dégueux, dégueuli and dégueulasse. It sounds prim, horrified and over-the-top, turning mild nausea into full moral outrage. It comes from The Simpsons, season 8 episode 8, 'Une Crise de Ned.'