...when your daughter has her friend over the house. You walk downstairs and they're sitting next to one another on the sofa. Your daughter has a laptop, her friend has an Ipod touch, and they're texting one another.
So you look at the friend. You say, "I can't believe you left your house, walked all the way over here, came inside, sat down, and then started doing something you could've done in your own house."
"But I can see her," she protests.
"How can you see her?" you ask. "You're busy looking at that Ipod."
The two girls look at you as if you've just fallen from the sky, look at each other, laugh, and then get back to texting.