Place this clip right after the mistake is revealed, then follow it with the Nelson Ha Ha laugh for a mocking payoff, or use the wrong answer game show buzzer before it to set up the failed attempt.
About this sound
A man asks what are you doing, seriously, honestly, in a short voice clip that builds from genuine confusion to frustrated disbelief. The gaps between each question make it feel like he is still waiting for an explanation. It gives listeners instant secondhand embarrassment and judgment, the exact feeling of watching someone do something pointless in front of you.