>>Or, possibly, someone who's got such a fever going on that he's
>>become utterly, irrationally paranoid and thinks someone is trying to
>>poison everyone in the ship.
>
>There was one flu season when I imagined that there were about a dozen
>of me from very close parallel universes (each tagged, for
>convenience, with a little floating number) overlapping, not quite in
>phase, as I tossed and turned in bed, and this was the source
>of my discomfort and delirium.

Huh. Here I thought when I had that cold and became convinced the hot water bottle in the bed was an obsidian block and I had to use a diamond pickaxe to remove it, that was just a sign of playing too much Minecraft.