John Draper, aka Cap’n Crunch:
So, lets go back to the year 1972, when I got a phone call from Denny, a blind kid who turned me onto a toy whistle he got out of a Cap’n Crunch cereal box. With this whistle, it was possible to access the internal trunking mechanism of Ma Bell. In conjunction with a blue box (A special tone generating device), it was possible to take internal control of Ma Bell’s long distance switching equipment.