Cargo Cult Science
There is also a more subtle problem. When you have put a lot of ideas together to make an elaborate theory, you want to make sure, when explaining what it fits, that those things it fits are not just the things that gave you the idea for the theory; but that the finished theory makes something else come out right, in addition.
Cargo cult science is a term used by physicist Richard Feynman during his commencement address at the California Institute of Technology, United States in 1974 to describe work that has the semblance of being scientific, but is missing "a kind of scientific integrity, a principle of scientific thought that corresponds to a kind of utter honesty".