Any shit that scientists cannot explain, like atoms changing characteristics to identical ones when they're totally separate and disconnected, or measuring the width of hair by imagining how wide it is. Using lasers. Yeah, I know, wtf.
While ghosting is ending a relationship without explanation and ceasing all communication, spooking is then reaching out to someone you haven't talked to in a long time.
Example 1: Dude, I hit up Jessica last night! We totally hit it off, wish I wouldn't have waited 10 years to reach out. Turns out spooking works sometimes.
Example 2: Man I haven't talked to Kanye in forever, I should spook him.