Someone has written an analysis of Final Fantasy VIII based around the idea that Squall dies at the end of disc one and the rest of the game is his imagination in his dying moments. From the analysis:
This article discusses the possibility of Final Fantasy VIII's storyline covertly revolving around the death of its main character early on, a theory which - so far - appears to be undiscussed on the internets. We will attempt to explain the basis of the theory, and argue why it may be true. At the end of the article we concede that there is no real "proof", merely suggestions and hints. However, we hope this analysis will add meaning to the game for all players - perhaps refreshing its value over a decade since the game's release - and inspire a discussion as it did between us.
The article includes screenshots from CG scenes in the game and Youtube videos that are used to back up the theory. The entire analysis is also available under a Creative Commons license.