Binack: My sister had a job in a store at WDW throughout college. She said one time in a gift store, a parent asked if their son with cancer could meet Darth Vader. After my sister told them her store does not have a Darth Vader costume or even any Star Wars memorabilia, they freaked out and asked for her manager. After about an hour of waiting the child is greeted by my sister in a Darth Vader costume that came from across the park in a Star Wars section. Once greeted the parent told the child, "I knew we wouldn't have to walk to the other side of the park! I love cancer."

TL;DR: Parent used kid's cancer for perks, bragged about it.