You are holding your baby on your lap, cooing to her gently, and the baby, overcome with the sheer joy of your cooing, does what babies do best. You crinkle your nose, lift the baby up and place her on the rubber sheet. You then clean her up, and reach for the Shmuggles pack (or whatever the heck these things are called) and oops, you find that you're out of diapers. What do you do?
You dial for a diaper, of course.
I'm not making this up. I saw a van yesterday cheerfully proclaiming to answer just these kinds of calls.