Place it just after the bill is shown, then follow it with a shocked reaction to sell the size of the charge, and put a wait-and-see sound just before it while the payer hesitates over the total.
About this sound
This 15-second clip centres on Soren paying the water bill, turning an ordinary household chore into a short reaction-style moment. It feels awkward and relatable, like being caught with a charge you hoped someone else would cover, with a dry humour that suits shared living.