Place it at the very end of a checkout or exit scene, after the action is complete. Pair it with the ka-ching money sound just before it for a register moment, or follow a failed sale with a sad trombone sound effect for contrast.
Over dit geluid
This is Apu Nahasapeemapetilon saying his catchphrase 'Thank you, come again' in a bright customer-service voice, lasting under two seconds. It feels cheerfully routine and a little too polite, which makes listeners hear it as a comic, slightly sarcastic send-off. The line comes from The Simpsons, where Apu says it at the Kwik-E-Mart counter.