What is the best way to set up the Fake Format prank?

For the best reaction, try these tips:

• Copy the .exe to the target computer's desktop
• Rename it to something innocent like "System Check" or "Disk Tool"
• Be nearby to watch the reaction when the format dialog appears
• Let the fake format run to completion before revealing the joke -- nothing was actually formatted
• The format summary screen at the end is a good time to reveal the prank