Rubber Duck
The rubber duck presents a masterclass in passive durability. Constructed from vulcanised rubber or modern PVC polymers, these specimens can withstand repeated compression, temperature fluctuations from icy cold to near-scalding bathwater, and the enthusiastic grip of small children. Research indicates that rubber ducks maintain structural integrity for decades under normal use conditions. They require no maintenance, no healing time, and no emotional recovery. A rubber duck dropped from significant height simply bounces. One submerged indefinitely merely waits. The 29,000 rubber ducks that fell into the Pacific Ocean in 1992 continued floating for years, some washing ashore across the globe, their cheerful expressions undiminished by oceanic trauma.
Wolverine
Wolverine's durability operates on an entirely different paradigm. His mutant healing factor represents biological regeneration pushed to theoretical limits. He has recovered from nuclear explosions, complete cellular destruction, and being reduced to his adamantium skeleton. Yet this very capability reveals a fundamental vulnerability: Wolverine requires constant damage to demonstrate his durability. His skeleton, whilst indestructible, causes ongoing stress to his system. The psychological toll of centuries of violence, death, and regeneration has left deep scars that no healing factor can address. He can survive anything but cannot simply exist peacefully as his rubber counterpart does.