There are National days for donuts, potato chips, silence, clam chowder, and the Tooth Fairy, so why not a National Handcuff Day? Handcuffs are a necessity in a modern society. Police, jails, prisons, and other law enforcement agencies could not function without the modern handcuff. They are easy to use, reusable, and inexpensive. Also, there are many collectors who try to preserve the history of handcuffs, and escape artists have entertained people for over 100 years trying to escape from them.