Monday
Monday represents perhaps the most reliable phenomenon in human experience outside fundamental physics. Its arrival can be predicted with 100% accuracy to the microsecond, requiring only basic astronomical calculation. No Monday has ever failed to occur in recorded history.
This temporal certainty has made Monday the foundation of global economic scheduling. Trillions of dollars in commerce depend upon its predictable recurrence. The stock market opens, schools commence, and the machinery of civilisation reactivates based entirely on Monday's unwavering dependability.
Pikachu
As a fictional construct, Pikachu's reliability operates in the cultural rather than physical domain. The character has maintained consistent brand presence for 25 consecutive years without significant redesign or rebranding, a remarkable achievement in the ephemeral landscape of popular media.
However, Pikachu's existence remains contingent upon continued commercial interest and intellectual property maintenance. Unlike Monday, this entity could theoretically cease to exist if The Pokemon Company discontinued operations, introducing an element of corporate dependency.