This one's good.
Scene: my 10th grade history class
Cast: Me, my smokin' hot history teacher, the rest of the class
Story: It's the day before the unit test on the cultures of Africa, and the teacher is taking questions. I raised my hand to ask a legitimate question; I raised my hand to ask if she wanted us to know the role that sex plays in their society or do you want us to know the cultures' views on sex. So I asked, and she looked at me funny before stammering an answer. Satisfied, I looked back to my notes. Then she asked, "Do you have any idea what you just said?" I looked up, slightly confused. She went on to say, "You just said, 'Do you want us to know the role that sex plays in society or do you want sex?'" I turned and looked straight ahead, lowerd my head, and covered my face with my hands. The class laughed hysterically.
I actually was surprised because I didn't feel embarrassed, but I sensed I probably should be and acted accordingly, because if I didn't make it clear that it was a mistake, I would probably have gotten in serious, serious trouble. I thought it was actually pretty funny.
On a side note, that is my first and only Freudian slip that I can recall.
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"All generalizations are false, including this one."
--Samuel Langhorn Clemens a.k.a. Mark Twain