I tend to believe in quite a bit of things. Psychics, ghosts, aliens, alien visitations, alien abductions, Bigfoot, people with abnormal power, etc. Part of it stems from the fact that I'm a pretty gullible person, another part is that I can't actively say for certain with 100% that these things do or do not exist. Now, this isn't to say that I will jump to the conclusion about these things. If I see a book fall to the floor, I won't think an invisible person, ghost or otherwise, made it fall. If I see a book suddenly fly up and float across the room, yeah that'll be strange and I'll probably think something weird is going on, but there could still be a dozen explanations. If my findings don't come up with anything scientific, I would probably think ghost...key word being probably. If I had to describe the story to someone else, I wouldn't say, "Dude, it totally was a ghost". I would shrug and say "Probably a ghost or something. Can't exactly say".
Although the one thing I am on the fence about is this Multiverse/Multiple Worlds Interpretation theory. You know, the usual, "In this infinite universe there exists another you that has made different choices than what you have made". Sometimes I buy into that, other times I'm just like, "Wait, that seems a bit dumb". I don't know, I sometimes just have trouble wrapping my head around the scope of such a theory (although I do enjoy it).
But basically, if you tell me something crazy, I'll probably entertain the thought and not dismiss it. Suppose that makes me a bit of an idiot, but hey, if anything turns out to be true, at least I won't be too terribly surprised.