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It's like a loud, smelly confirmation that someone is totally wrong and you're right, but you're too lazy to explain it.
Da-kda kda, I said I was right about the test. You failed it. I passed it. No questions asked.
Da-kda kda, you said you'd bring the snacks. You brought a bag of chips and a half-eaten donut. That's not a snack, that's a crime.
Da-kda kda, I told you the Wi-Fi password was 'password'. You put '1234'. What even is that?