Is everybody paying attention?

I don't have students today, but here is a conversation I had about 30 min before the end of yesterday.

Student: "So, I didn't realize that we were supposed to turn in our assignments."

Me: "Wait, what?  What did you think that you were supposed to do with them?"

Student: "I don't know.  I wasn't really paying attention.  I spend a lot of time on Facebook."

Me: "So you didn't get the hint when everyone else was turning in papers?"