Funny jokes: Is it cool or two pieces?

The aunt got into the air-conditioned car and invested a dollar. The driver said: "Two yuan." The aunt said: "Yes, it's cool." The driver said: "An air-conditioned car costs two yuan!". The aunt replied: "Air-conditioned cars are cooler." The driver said again: "Put in two yuan!" The aunt said with a smile: "It's not only cool on the bald head, but also cool on the whole body." After that, she walked back. The driver said helplessly: "I told you to invest two yuan." The aunt said: "I think it's cooler when there are fewer people in the back." The driver was speechless...