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Does the engine shut off immediately or does it tend to run on for a few seconds before quitting?
Are you driving with the A?C on and then parking it over a drip tray in the garage? The water output from the A/C dripping onto a tray could produce a sound like that.
Otherwise I would agree that it tends to be more of a tick usually, as the car cools down.
When most people talking about "pinging" (detonation/knocking) they usually refer to driving the engine under load (eg accelerating or going up a hill) and hear a sound usually described like rattling keys or marbles.
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