Pangrams are short sentences that include all 26 characters of the alphabet. They’re commonly used to help users of the font quickly assess a character set. They may also be useful to designers in the process of designing their own work but they are too compact for a more thorough assessment.
Perhaps the most common pangram is The quick brown fox jumps over the lazy dog.
Check out these links- typophile thread, and a typowiki entry for a lot more insane-er pangrams.