This paper follows the tradition of treating Zhuangzi's Butterfly Dream episode as presenting a version of skepticism. However, unlike the prevalent interpretations within that tradition, it attempts to show that the skepticism conveyed in the episode is more radical than it has been conceived, such that the episode can be read as a skeptical response to Descartes' refutation of skepticism based on the _Cogito, ergo sum_ proof. The paper explains how the lack of commitment in Zhuangzi to the dubious assumption (...) about 'I' that it necessarily refers to something existing to which Descartes seems to uncritically adhere allows Zhuangzi to doubt what for Descartes is absolutely indubitable: _I exist_. (shrink)