1. What does Pony do when he gets home from visiting the hospital with Two-Bit? Why does he do this?

They get high. He does that because he didn't have a good time in years.

When Two-Bit and Ponyboy arrive at the hospital, the nurses won't let them see Johnny. However, the doctor permits their visit because Johnny has been asking for them and it "can't hurt now." With that foreboding statement, the boys go in and find Johnny awake and able to talk. Johnny knows that his condition is not good, and he is afraid of dying. He tells them that 16 years is not enough living and that it is just not fair. Johnny's mother shows up to visit him, but Johnny refuses to see her: "Tell her to leave me alone. For once." He passes out after this incident, and it is evident that he is experiencing a great deal of pain.

hallo it's a pleasure to meet you