Place this clip after the failed calculation in your edit, then follow it with a badum tss for the punchline beat, or contrast it immediately with a correct ding when the right answer finally appears on screen.
關於此聲音
This is a roughly 19-second spoken clip of Dilma Rousseff giving a tangled percentage explanation in a calm, serious voice. It feels funny and awkward because the confident delivery clashes with the circular math. It comes from the former president of Brazil and spread through Brazilian meme culture as a reaction to bad calculations.