Douglas R. Hofstadter

Hofstadter's Law: It always takes longer than you expect, even when you take into account Hofstadter's Law.

When you're not looking at it, this sentence is in Spanish.

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."

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" ...