I went to the Nationals baseball game last night and was surprised to discover that when you buy a bottle of Pepsi, the concession stand person removes the top before letting you walk away. She was apologetic and I quickly discovered why—it’s much harder to carry two sodas, a hot dog and a pretzel when the tops aren’t on the bottles. When I asked her why she had to remove the caps, she explained that they don’t want people throwing the tops onto the field. I have a different explanation. Can you come up with one?