I have a great story related to this.
My sister and her family were in DW about a month ago. While waiting in line for Dumbo (very long line...) her youngest daughter commented that she would really like to see the Little Mermaid, which they could see had no line. As they were discussing this, the family in back of them said "go ahead and run over and we'll save your place". Well, they went over to Ariel, but my sister felt really funny about jumping back in line, so she told they kids that it really wasn't right, and they shouldn't do it. They all agreed, and decided to head over to Goofy's Barnstormer instead.
As they got off GB, they were handed Dream Fastpasses!!

She told the kids that was their reward for not doing "the wrong thing" by cutting in line.