I want a joke with few words but super funny~

The eldest brother and the second child went to the theater to watch a play again. They saw the two of them arguing about the development of the plot and made a bet. The eldest brother pointed to the spittoon and said: "The loser has to take a sip of what's in there." .Unfortunately, the eldest brother lost, so he frowned and took a sip. The two continued to bet on the following plot. This time, the second eldest son lost. The second eldest son picked up a spittoon and drank fifteen big gulps in a row. The eldest son said to the second eldest son in admiration, "You are so amazing, you can actually drink fifteen gulps in a row!" The second eldest brother shook his head, "I don't want to drink it, the phlegm in the spittoon is too thick, I just can't stop biting it!"