Smullyan was well-known for his paradoxical stories. This, of course, is Smullyan speaking, not me, as I have never been to the Island of Knights and Knaves, where Knights always tell the truth and Knaves always lie.
"Once when I visited the Island of Knights and Knaves, I came across two of the inhabitants resting under a tree, I asked one of them, 'Is either of you a Knight?' He responded and I knew the answer to my question."
from What is the Name of This Book?
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