Ten years ago, when people get bored, they masturbated frenetically until they went to sleep. Today, people does strange (and sometimes useful) things.
This is one of the most incredible utilities for a Pringles tin: making an antenna. You can read the article in O’Reillynet and see a photo here.
Get a lot of info about antennas in the Antennas WebSite of the Technical University of Valencia (information is in Spanish and in English).