You could use either a tape stop or an abrupt cut with a delay.
Here’s a link to a video explaining a tape stop style use of the pitch shift. I’m sure you can figure out how to make an echo though.
Of course depending on how ridiculous you want to be there’s always something totally irrelevant like breaking glass or a dog barking that can be funny. I was watching this show, Moon Boy, the other day and they bleeped out some curs words with a banjo, recently found by the main character and totally unrelated to the story. It was fantastic. Not that your editing naughty words, but you get the idea.
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