Based on the context and the answer, generate a question. 

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 .

Answer:

They kept joking about the rocks .



What may be the reason why class was so funny ?