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A verbal prank commonly used by in a conversation, with the intent of annoying the listener. In this prank, there are two parties having a conversation: person A (the pranked) and person B (the pranker). Person A makes a simple, innocent remark with no double meanings. Person B initiates the prank and replies, "I know what THAT means" (note the emphasis on the word "that"). The prank is that person A begins to feel insecure or uncomfortable about what they have said, because the phrase, "I know what THAT means" gives the impression that person B misunderstood what was said (i.e. thinks it has a sexual meaning, or thinks they're lying about something). Person A is completely unaware that person B is just trying to annoy them. After this, person B could proceed to only say, "I know what THAT means."
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