Tourist Trap - S1-E6
Corrected entry: One of Sparkville's 'giant' attraction is a huge ketchup bottle - filled with ketchup. It would rather be strange to keep the stuff - or even just paint - in a huge bottle out in the open, since it would either spoil, evaporate or dry up, and refills would come too expensive for a container this size.
Correction: It wouldn't evaporate as ketchup's a paste, not a fluid. It wouldn't dry up as long as the lid was on it. It wouldn't spoil as long as it had never been opened (ketchup in the grocery store isn't refrigerated). There's no reason not to have it full. And every reason, even if they must refill from time to time, to keep it topped off: tourist money.
Phixius ★