Gremlins

Gremlins are fictional creatures from folklore and popular culture, often depicted as mischievous or malicious beings that cause mechanical failures, accidents, or chaos, especially in military and aviation contexts. Originating from early 20th-century stories, they became widely known through movies and stories where they sabotage equipment or create havoc. While they don't exist in reality, the concept symbolizes the physical or technical problems that disrupt operations, often attributed humorously to these elusive, troublemaking entities.