Term first coined in 1985 by Peter Harzewski that states, “Any random piece of visual material (film or video) - and any random piece of music will eventually synchronize and appear to be intentionally linked.”

To illustrate the effect, here is an animated image of Christopher Eccleston from the 2005 season of Doctor Who. If you combine it with a completely unrelated music sample, you get this.

The Harzewski Effect seems to have vanished from Wikipedia—apparently some of the editors decided it was a “neologism” and removed the article—but you can still see it referenced on some websites, such as the one for this media production company.