Link place names into jokes

I stayed in a hotel yesterday, and the mineral water in the hotel room was actually 18 yuan a bottle. I bought two bottles of the same brand outside, spent four yuan, and changed two bottles in the hotel, but I couldn't find them after rounds. . . This is called economic mind, and the difference of 9 times is instantly available. I'm drinking a bottle of mineral water from 18 yuan, which is awesome!