There has been a pencil laying in front of the refrigerator at my house for three days straight... and I've just been waiting for someone else *coughhusbandcough* to notice and pick it up. So I understand this mom on a spiritual level.
Miranda Crimbring's family knows that if you see trash on the floor than you pick it up. So she conducted a little experiment, and taped a $5 to the bottom of a piece of paper and left it on the bathroom floor just to see how long it would take until someone picked it up.
A couple of days after the original post, there was an update!! The daughter finally picked up the piece of paper! However, the meaning of the experiment was lost on her, because she took the money and ran... leaving the paper on the counter.