What is the best way to set up the Popup Prank prank?

For the most convincing effect:

• Use a personal photo: Display a picture of the target or their coworkers to really catch them off guard
• Set a reasonable delay: A short delay after the browser opens makes it feel like a real popup ad
• Enable repeat popups: Having it pop up multiple times mimics persistent adware, making the target think they have a real problem
• Add it to Startup: Place a shortcut in the target's Startup folder so it runs automatically every time they log in