King Kong
Despite his impressive physical constitution, King Kong has demonstrated concerning vulnerabilities. Conventional military aircraft have proven sufficient to neutralise the creature on multiple occasions, and he appears susceptible to both bullets and gravity when the two are applied simultaneously.
His various cinematic iterations suggest a species with limited reproductive success and poor long-term survival prospects. Each appearance typically concludes with his demise, requiring complete narrative resurrection for subsequent instalments.
Procrastination
Procrastination exhibits remarkable persistence across all therapeutic interventions. Cognitive behavioural therapy, medication, productivity apps, and stern lectures from authority figures have all demonstrated limited long-term efficacy against this phenomenon.
Archaeological and historical records confirm that procrastination has survived every major civilisational transition, including the Agricultural Revolution, the Industrial Revolution, and the Digital Age. Indeed, each technological advancement appears to have strengthened rather than weakened its grip on human behaviour. It is, functionally, immortal.