Who knows what joke this is?

One day at noon, Lao Liu happened to meet Lao Zhang on the road. He immediately said hello and took out a dime from his pocket and gave it to Lao Zhang.

Lao Liu said, "Lao Zhang, I lent you a dime the day before yesterday, and I won't pay it back until today."

Lao Zhang said: "Forget it, a dime, what else!"

"Give it back to me, give it back to me!" Lao Liu just stuffed a dime into Lao Zhang's hand.

Lao Zhang had to accept it and said, "If you really want to pay it back, I'm welcome. I will close this account when I go back later! " "