Place it at the start of an entrance beat, after a knock and before the reaction, so the arrival lands before anyone speaks. Pair a door knocking sound with it first, then let a bell ding follow the greeting for a second comic beat.
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This is a very short, just over half a second, two-note ding-dong doorbell sound, with a bright first chime followed by a lower second chime. It feels playful and instantly familiar, like a cartoon doorbell announcing an unexpected visitor, and it lands as a quick laugh rather than a serious alert.