Phone conversation

Phone rings. I know its J calling.
Me: Hey
J: Hey, hows it going?
M: Good. How are you?
J: Good. What are you doing?
M: Reading.
J: Reading? Reading for what?
M: Just reading.
J: Oh ok. Sorry I didn't call you back last week. We had a surprise party for....
I just thought it was funny about the why are you reading. It is weird that we actually have time to read since during the semester it is all about papers and research for our classes. We just spent more time talking about our classes next semester and when we can get together to have lunch soon.