Who can tell jokes?

Dad asked Xiaoming to buy a bottle of wine.

Tell him that no matter what the boss's bid is, it's half price.

Xiao Ming nodded and left. Xiao Ming: How much is this wine?

Boss: 80.

Xiao Ming: No, 40.

Boss: 60.

Xiao Ming: No, 30.

Boss: 40 then.

Xiao Ming: No, 20.

Boss: 30 is always ok!

Xiao Ming: No, 15!

The boss is angry: I will give it to you for nothing!

Xiao Ming: No, I have to send two bottles.