Try using it on someone. Keep a straight face though. "Haha ... yep ... by the way, did you know that 'gullible' -- though commonly used -- is not technically even in the dictionary?" They'll furrow their brow, get an incredulous look on their face, and say something like, "Wow, that's really weird." Don't correct them ... let them figure it out. I had one guy call me weeks later after he got into an argument with another person over whether the word exists or not and attempt to correct me. I just said, "Wait, you believed me? Haha!"
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