Place this clip at the exact moment a Heidelberg reference appears in your edit, after any on-screen text that sets it up. Follow it with a short reaction sound for the response beat, and keep reaction or commentary clips after it rather than placing anything over the name itself.
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The Heidelberger clip is a short sound button lasting just over four seconds, carrying that one name as its whole identity. It gives a listener a puzzled, amused feeling, because such a specific name arriving on its own feels random and abrupt, and that odd specificity makes the brief moment stick in the memory.