Place it at the reaction beat itself, after the reveal has landed on screen. For a bigger build, lead in with the anime wow sound effect for the stunned look, then follow this clip with the romance sound effect when the crush angle is the joke.
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This is a short cartoon ahooga horn blast, the old two-tone car horn that honks out in a goofy a-oo-ga rhythm in under two seconds. It feels silly and instantly over-the-top, turning a simple reaction into wide-eyed cartoon excitement, like a character has just spotted something and completely lost their cool.