Did you ever want to see the database queries an arbitrary PHP MySQL application runs? It takes two free downloads and 62 characters to see them.

• Get PHP 5.3.4-dev
• Get PECL/mysqlnd_qc
• Add 19 characters to your configure line: --enable-mysqlnd-qc
• Add 43 characters at the end of applications source, e.g. using the auto_append_file configuration setting: var_dump(mysqlnd_qc_get_query_trace_log());
• Start your query analysis

array(329) {
  [0]=>
  array(8) {
    ["query"]=>
    string(27) "SET @@session.sql_mode = """
    ["origin"]=>
    string(1330) "#0 /home/nixnutz/Downloads/oxid/core/adodblite/adodbSQL_drivers/mysql/mysql_driver.inc(352): mysql_query('SET @@session.s...', Resource id #26)
#1 /home/nixnutz/Downloads/oxid/core/adodblite/adodb.inc.php(316): mysql_driver_ADOConnection->do_query('SET @@session.s...', -1, -1, false)
#2 /home/nixnutz/Downloads/oxid/core/oxdb.php(216): ADOConnection->Execute('SET @@session.s...')
#3 /home/nixnutz/Downloads/oxid/core/oxconfig.php(479): oxDb::getDb()
#4 /home/nixnutz/Downloads/oxid/core/oxconfig.php(406): oxConfig->_loadVarsFromDb('oxbaseshop')
#5 /home/nixnutz/Downloads/oxid/core/oxconfig.php(448): oxConfig->init()
#6 /home/nixnutz/Downloads/oxid/core/oxsupercfg.php(115): oxConfig::getInstance()
#7 /home/nixnutz/Downloads/oxid/core/oxutilsobject.php(207): oxSuperCfg->getConfig()
#8 /home/nixnutz/Downloads/oxid/core/oxutilsobject.php(109): oxUtilsObject->getClassName('oxutilsobject')
#9 /home/nixnutz/Downloads/oxid/core/oxutilsobject.php(74): oxUtilsObject->oxNew('oxUtilsObject')
#10 /home/nixnutz/Downloads/oxid/core/oxfunctions.php(284): oxUtilsObject::getInstance()
#11 /home/nixnutz/Downloads/oxid/core/oxutils.php(101): oxNew('oxUtils')
#12 /home/nixnutz/Downloads/oxid/core/oxfunctions.php(448): oxUtils::getInstance()
#13 /home/nixnutz/Downloads/oxid/index.php(72): require_once('/home/nixnutz/D...')
#14 {main}"
    ["run_time"]=>
    int(0)
    ["store_time"]=>
    int(0)
    ["eligible_for_caching"]=>
    bool(false)
    ["no_table"]=>
    bool(false)
    ["was_added"]=>
    bool(false)
    ["was_already_in_cache"]=>
    bool(false)
  }
...
}

If you want to know more, check this presentation.