Cat
The domestic cat's daily utility manifests in irregular bursts of uncertain value. Cats offer pest control—though modern indoor cats rarely encounter prey requiring elimination—companionship presence when they deign to appear, and ambient warming when they choose to occupy human laps. The cat's utility schedule remains entirely self-determined, with peak activity occurring at 3am when human utility requirements are typically minimal. One cannot summon a cat for comfort; one may only hope it arrives when needed.
Toilet
The toilet presents an entirely different utility proposition: absolute reliability, multiple daily deployments, zero scheduling conflicts. The average human visits the toilet six to eight times daily, finding it consistently available and prepared for service. The toilet has never once declined a visit, demanded alternative timing, or wandered off when most urgently required. Its utility, whilst unglamorous, represents the very foundation of civilised domestic existence. Without the toilet, the cat's litter tray would be the least of household concerns.