I love when someone gives you a patronizing answer to your question. "Didn't you read the memo? If you had, you would know the answer would be X". Yes, I read the memo. Then you repeat the actual issue in your first question. This time they listen and take the time to think about the answer, and come up with a completely different answer.
It is particularly annoying when the same person does it to you more than once. Remember last time you treated me like an idiot, and then it turned out it was you who wasn't paying attention. No, I didn't think you remembered.