I recently stumbled across the Liar Paradoxon again. The Liar Paradoxon (probably known as "All Cretians are Liars (No offense)) says, that if i (as a Cretan) say "All Cretans are Liars", this creates a Paradoxon.
Im pretty sure that i've found a solution to that (if there already is, i dont know that).
But i wont tell you, you'll have to figure that out yourself...