In this eighteenth episode Charlie has a big surprise one of its ex, Jill became a man, Bill. Practically all the funny situations of this very good episode rest(base) on this funny basic premise. Of this idea of original base(basis), the whole becomes even funnier when Bill goes out with the mother of Charlie who does not know about the history(story). The humor of this episode is very representative of the series at the same time ironic, heavy without ever being too vulgar, cruel. Everything the characters are for the diapason and in particular Charlie and Berta. But it is necessary to admit that all the scenes(stages) are not for the same excellent level and of constancy in the laughter. In any case this episode is one of the best of this rich season due to its originality and its saving freedom of speech.