Context: Wow ... I ' m so fucking immature . But tonight was a fucking funny class . I was in Geology , and we were covering Igneous rocks ( lava rocks , basically ) . We were talking about how different types of rocks melt at different points , and how the higher melting points work and all that .

Question: What may be the reason why class was so funny ?
Options:
0. They were laughing at themselves .
1. They were laughing at their classmates .
2. None of the above choices .
3. They kept joking about the rocks .
Answer: 3