Monday
In terms of operational consistency, Monday represents perhaps the most reliable phenomenon in human experience. Since the adoption of the seven-day week by the Babylonians approximately 4,000 years ago, Monday has arrived without fail, without delay, and without exception.
No force in nature or human ingenuity has successfully prevented a Monday from occurring. Leap years, calendar reforms, and global pandemics have all failed to disrupt this inexorable cycle. Monday's coefficient of reliability stands at precisely 1.0, a mathematical certainty unmatched in the natural world.
The Joker
The Joker's reliability suffers considerably from his dependence on narrative requirements. Long periods of incarceration in Arkham Asylum interrupt his reign of terror with frustrating regularity. Creative team changes, publishing schedules, and cross-over events all influence his operational capacity.
Furthermore, his plans frequently fail, defeated by Batman with a consistency that borders on the predictable. Analysis of his historical success rate reveals approximately 12% of schemes reach completion, a figure that would embarrass any serious organisation.