Why do people feel the need to ask the obvious? Even I'm guilty of it. I'll walk into a room, look at someone and ask what they are doing, even when it's pretty obvious.
This is where we need to get back to thinking before we speak. Ask what they are watching, what they are reading, what they are playing. Be specific. Engage a real conversation, not just a superficial one that is going to cause eye rolling because it's pretty obvious what they are doing.