Douglas R. Hofstadter
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Hofstadter's Law: It always takes longer than you expect, even when you take into account Hofstadter's Law.
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When you're not looking at it, this sentence is in Spanish.
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All the limitative Theorems of metamathematics and the theory of computation suggest that once the ability to represent your own structure has reached a certain critical point, that is the kiss of death: it guarantees that you can never represent yourself totally. Godel's Incompleteness Theorem, Church's Undecidability Theorem, Turing's Halting Problem, Turski's Truth Theorem-- all have the flavour of some ancient fairy tale which warns you that "To seek self- knowledge is to embark on a journey which . . . will always be incomplete, cannot be charted on a map, will never halt, cannot be described."
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Tortoise: But we must be careful in combining sentences. For instance, you'd grant that "Politicians lie" is true, wouldn't you?
Achilles: Who could deny it?
Tortoise: Good. Likewise, "Cast-iron sinks" is a valid utterance, isn't it?
Achilles: Indubitably.
Tortoise: Then, putting them together, we get "Politicians lie in cast-iron sinks" ...