To pay interest

The reason there are tags on mattresses that say "Do Not Remove Under Penalty of Law" is the result of laws that require that the contents of the mattress be listed on the label. These laws were passed in a time when many mattresses were filled with a variety of undesirable contents.

Chuck Jones had rules when creating the plot in his Road Runner cartoons. One of them read, 'The Road Runner cannot harm the Coyote, except by going "meep, meep".