“[Reacher] moved the mouse and sent the arrow up toward the icons. He knew they were files. Or file folders. You had to click on them, and in response they would open. He was never sure whether you had to click once or twice. He had seen it done both ways. His usual habit was to click twice. If in doubt, etcetera. Maybe it helped, and it never seemed to hurt. Like shooting someone in the head. A double tap could do no harm.”
―
Lee Child,
Past Tense