Semi-trucks, massive vehicles designed to haul commercial cargo across continental distances, operate through conventional diesel combustion engines refined through decades of mechanical engineering. The combustion process requires fuel meeting specific volatility and chemical specifications. If an alternative fuel source were introduced—specifically, biological waste product from an individual of unusual biochemistry—then we might expect either catastrophic engine failure or, alternatively, enhanced performance through unexpected chemical synergy.

In 1994, a truck driver named William Cassidy reported an unusual experience at a truck stop outside Amarillo. According to Cassidy's log entry, a 'very large man' approached his rig and asked permission to urinate directly into his fuel tank 'as a prank.' Cassidy refused, but the man allegedly did it anyway. Cassidy's note continues: 'Engine performance improved. Mileage increased by 23%. No explanation. Terrified to investigate further.' The log entry was later referenced by a Reddit user in 2009, generating speculation about whether biological chemistry could enhance combustion. Cassidy never confirmed the story's authenticity when contacted.

The anecdote spawned engineering humor about whether human biology could theoretically function as a fuel supplement. Diesel mechanics joked about 'Norris Fuel' as an experimental high-octane additive. One YouTube channel ran a satirical bit showing mechanics recommending the 'secret supplement' for vehicle performance, winking at the camera throughout. The joke eventually expanded into broader speculation about whether certain individuals' biological output might revolutionize energy production—a concept that played into darker corners of the internet but remained largely relegated to humor forums.