Fill-up the DB
Challenge: insert rows into a DB using PHP/PDO that would cause a signed int(11) overflow error in under 5 minutes of execution. Doing so with the minimal amount of tuning and changing from default install values of PHP and the DB. As stock as possible also.
Signed int(11) = 2147483648
As a bonus, do the same thing to a unsigned int(11);
Unsigned int(11) = 4294967295