The 'UltraCool' joke is a standalone application. When executed it first asks to enter first and last names of a user. Then it outputs the following message:
Error This application stopped responding to the computer.A LOW level Hard Disk format will procede in 27 seconds if cancel button in not pressed WARNING: THIS WILL DELETE ALL INFORMATION STORED ON YOUR HARD DRIVE
Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.
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This dialog has a 'Cancel' button. After that the countdown starts. The 'Cancel' button can't be clicked because it moves away when mouse cursor appears near it. When the counter reaches zero the screen goes blank for a second and then the joke shows a message in big letters 'Just Kidding...'. Shortly after that there appears 'Done' button. After this button is clicked the joke passes control to the system.
The joke is written in Visual Basic.