Six: Suffers from hallucinations of Gaius fairly regularly, though she can't explain it. She figures she's been driven insane. Of course, she's a Cylon and Death doesn't know her, so I don't know if that counts.
Sam Winchester: Has had demons putting him through paranoia and possessing and lots of stuff occasionally, so sometimes, he flickers in and out of it. Plus, he used to be psychic!
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Six: Suffers from hallucinations of Gaius fairly regularly, though she can't explain it. She figures she's been driven insane. Of course, she's a Cylon and Death doesn't know her, so I don't know if that counts.
Sam Winchester: Has had demons putting him through paranoia and possessing and lots of stuff occasionally, so sometimes, he flickers in and out of it. Plus, he used to be psychic!