Apart from the “motorized goalposts” that one person mentioned, Pharyngula commenter a_ray_in-dilbert_space had a pretty good idea. In science, the explanation gets clearer.
The problem with most pseudoscientific endeavors is that the problem does not converge. Mechanisms get more and more complicated to account for negative results while preserving the gist of the original proposal. This is a dead sign that it ain’t science.
Dead giveaway, I guess.