Possible rival explanations are coincidence, fudging of data, and third factors. The Telltale Signs of Pseudoscience 1. Pseudoscientific claims often involve fallacious scientific reasoning of the sort exemplified by the preceding fallacies. Pseudoscience can occur within the bounds of legitimate scientific disciplines. Pseudoscience tends not to be self-correcting.
Pseudoscience produces very little explanatory theory.
Rarely do pseudoscientific claims change much over time. Pseudoscientists tend to view skepticism as a sign of narrow-mindedness. Aliens exist and perform abductions because I've heard of such instances. You can do this with outdated horoscopes, too.