Rubber Duck
Ninja
The ninja's approach to stealth, whilst historically celebrated, relies upon active concealment—a fundamentally more labour-intensive methodology. The traditional shinobi required specialised clothing, extensive training in shadow manipulation, and knowledge of architectural blind spots. Modern security systems, infrared detection, and CCTV have rendered these techniques largely obsolete. Furthermore, the very mystique surrounding ninjas means that their presence is actively sought and suspected, representing a critical failure in true operational invisibility. One cannot be stealthy when everyone is looking for you.