The goal of this challenge is to write code that will execute once and only once. This means basically that it damages the program, script, or environment in some way. If rebooting the system allows the code to run again that is permitted.
Number of votes. All assumptions must be clearly listed. Any answers just initiating a reboot or halt will be disqualified.
Additional Rules because Greg Hewgill is a demi-god
No root access is permitted.
The contest will close on May 31, 2014.
This contest has been changed to popularity contest.