Lost: Dave

As Libby starts helping Hurley work through his weight issues, he appears to be losing his mind. He starts seeing Dave, a figure from his stay at the mental institution who he apparently had imagined back then. As he questions his own sanity, Dave has him convinced that the entire island is one big hallucination and the only way to wake up is jump off a cliff. Libby intervenes, convinces him everything is real and they kiss. What Hurley doesn't realize is that she too was at the mental institution as a patient but the significance of that remains a mystery. Meanwhile Locke confronts "Henry Gale" who claims that he never pushed the button when the alarm went off and that the system reset itself after the hieroglyphics and map appeared.