YOU WILL DRINK THE COFFEE UNTIL I CAN SEE MY FACE IN THE BOTTOM OF THE CUP! I did not mean to roar. But it's a clay cup. I DO NOT CARE! He finished the coffee. You did not have to finish it, I said, because I could perceive that he was rebuilding the Great Wall of China with shit bricks.
In a moment of frustration, the speaker expresses an intense demand for someone to drink their coffee until the bottom of the cup is visible. The command is delivered forcefully, emphasizing the absurdity of the situation by noting that the cup is made of clay. Despite the aggressive tone, the individual complies and finishes the drink, which leads to a realization of the ridiculousness of the scene.
The speaker reflects on this act, suggesting that the act of drinking the coffee is akin to a futile endeavor, comparing it to trying to build something substantial out of worthless materials. This contrast highlights the absurdity of their circumstances and the depth of their discontent with the situation at hand.