Most Annoying Computer Virus Prank Ever

Most Annoying Computer Virus Prank Ever
Very annoying computer virus prank which can easily freak someone out.
Try this only with friends and family members, do not create this on any public computer or unknown's person computer.

Command on Shortcut. cmd /k shutdown -r -t time_in_second /c "Your Message"
Like cmd /k shutdown -r -t 250 /c "Your computer is hacked and being monitored on unknown location to prevent this microsoft is shutting your computer down"

Do not assign time duration less tahn 4-5 minute less than 300 sec otherwise it will become hard to abort automatic shutdown.

After your Prank is done revert everything back to original -
1. Delete shortcut from startup folder & desktop.
2. Enable Desktop icons and my computer icon
3. Reset mouse & taskbar settings to original.
4. Change the Backgroud.

Which are very easy.