Monday
Monday possesses what scientists term absolute temporal permanence. It cannot be destroyed, damaged, or even meaningfully delayed. Every attempt to extend the weekend merely postpones the inevitable confrontation. Bank holidays provide temporary respite, yet Tuesday simply assumes Monday's psychological burden in such instances.
The weekday has survived the fall of empires, world wars, and countless attempts at calendar reform. It exists as a conceptual constant, immune to physical attack, nuclear weapons, or strongly-worded complaints to management.
Wolverine
Wolverine's durability manifests through his mutant healing factor, which enables recovery from wounds that would prove fatal to ordinary organisms. His adamantium-laced skeleton provides structural integrity that has withstood impacts, explosions, and numerous encounters with equally powerful adversaries.
Yet Wolverine is not invulnerable. He has experienced death in various comic storylines, been temporarily depowered, and faces the constant threat of editorial decisions. His existence remains contingent upon continued publication and audience interest.