We put such stock into our scientific theories, but the reality is...we know so very little for certain. Accepted theories of what we take to be true change consistantly. We should therefore be open to ideas and possibilities that perhaps lie outside the box.
Don't be so quick to judge or dismiss things like UFO's, paranormal activity, or parallel dimensions just becuase they don't fit into what we think we know.
Just remember that the universe may very well be infinite, and we can't even venture out of our solar system.