A contradiction essentially similar to that of Epimenides can be created by giving a person a piece of paper on which is written: 'The statement on the other side of this paper is false.' The person turns the paper over, and finds on the other side: 'The statement on the other side of this paper is true'. It seemed unworthy of a grown man to spend his time on such trivialities, but what was I to do? There was something wrong, since such contradictions were unavoidable on ordinary premisses. Trivial or not, the matter was a challenge.
Source: The Autobiography of Bertrand Russell, v.１, chap. 6: Principia Mathematica, 1967
More info.:http://russell-j.com/beginner/AB16-050.HTM