Rocket
The rocket represents humanity's most magnificent exercise in controlled inefficiency. The Saturn V consumed 20 tonnes of fuel per second during launch. Approximately 90% of a rocket's mass consists of propellant, meaning the actual payload represents a tiny fraction of what leaves the launch pad. The rocket equation is beautiful but tyrannical.
Modern improvements through reusability have enhanced efficiency considerably. The Falcon 9 first stage returns to land on its own propellant reserves, though this itself requires carrying fuel to brake the descent. Rockets fight gravity, and gravity always extracts its tribute.
Spongebob
SpongeBob demonstrates remarkable metabolic efficiency. His primary sustenance appears to be the ambient seawater of Bikini Bottom, supplemented by occasional Krabby Patties. He maintains manic energy levels sufficient for an eight-hour shift at the Krusty Krab, followed by extensive jellyfishing activities, with no apparent caloric input proportionate to his output.
The physics of SpongeBob's universe operate under different constraints than our own. His body generates sufficient kinetic energy for bubble-blowing at industrial scales, karate with Sandy Cheeks, and enthusiastic laughter, all whilst remaining a filter-feeding organism. The efficiency defies thermodynamics but remains canonically consistent.