Normal people (i.e., people w/o diseases or MI) get hallucinations.

There's an interesting article that talks about how 1 in 20 people have experienced delusions and hallucinations that are not a result of drugs, alcohol, dreaming, or MI:
1 in 20 People Have Hallucinated

Here's another interesting article talking about the same thing:
http://www.nytimes.com/2012/11/04/op...s-do.html?_r=0

So, unless you're in an episode, it usually doesn't mean much if you hallucinate. Hallucinations and delusions can both be mild in nature, and are rather common.