Cap'n Crunch
Cap'n Crunch ® is a breakfast cereal manufactured by the Quaker Oats company of Chicago. It is one of many sugary cereals targeted towards children, and the majority of its TV advertising is aired during children's TV programming on Saturday mornings and weekday afternoons, during children's peak viewing hours.The cereal itself is a mixture of mashed maize (corn) and syrup, shaped into pieces that resemble barrels (of the sort that used to be a fixture of pre-ironclad sailing ships). The cereal is promoted by friendly old "Cap'n Crunch," a cartoon sea captain whose adventures revolve around the cereal. Cap'n Crunch's animated commercial adventures have given Quaker Oats the opportunity to spin off additional cereals based on the original, including Crunch Berries and Peanut Butter Crunch.
Neal Stephenson's novel Cryptonomicon contains a several-page-long passage about how to prepare and enjoy a delicious bowl of Cap'n Crunch.
Cap'n Crunch is also the alias of John Draper, a famous phone phreaker. A blind friend of John Draper informed him that a toy whistle that was, at the time, packaged in boxes of Cap'n Crunch cereal could be easily modified to emit a tone at precisely 2600 hertz. This frequency was used by the long-distance trunks in-band signaling to specify an idle condition. This would effectively disconnect one end of the trunk, allowing the still connected side to enter an operator mode. Experimenting with this whistle inspired John Draper to build blue boxes: electronic devices capable of reproducing other tones used by the phone company.
This vulnerability of the older phone call routing switches has long since been corrected by using separate circuits to transmit voice and signals, and by using more sensitive equipment, but it resulted in the Cap'n Crunch whistles becoming valued collector's items. Some hackers sometimes go by the handle "Captain Crunch" even today, as a result of this incident and 2600 The Hacker Quarterly is named after the frequency of the whistle.