Find a random Wikipedia article and read the introduction. Then, click "Next" to find an even more fascinating topic!
Stare at the wall for 10 minutes without blinking. Record your thoughts. Repeat daily.
Watch 5 minutes of cat videos. Repeat. Do not engage in any activity that resembles 'productivity'.
Research the history of dental floss. Read every article, book, and thesis you can find. Create a comprehensive report.
Look into the void of your own existence. Ponder the meaninglessness of life. Repeat as necessary.
Call your mom. Tell her you're busy. Hang up.