This week the lesson will be about the Paranoia Crystal!

The paranoia crystal causes and spreads paranoia when touching a witch, it doesn't effect humans.
The term paranoia is usually used to describe excessive concern about one's own well-being, sometimes suggesting a person holds persecutory beliefs concerning a threat to themselves or their property and is often linked to a belief in conspiracy theories.

We saw this crystal in the episode "Extreme Makeover: World Edition (season 7).
You can see a picture of it below: