The 8th house is the house of deep secrets, the subconscious mind, and sudden events. Rahu is the planet of obsession and illusion.
When Rahu sits in the 8th house, it creates a highly active, almost obsessive subconscious mind. Dr. Sharma warns about a very specific psychological trap: This person constantly talks to themselves in their head ("khud se baatein") and over-analyzes every situation.
Because of their sharp intuition, they start suffering from a "God Complex," believing they can control everything and everyone ("duniya tere haath mein hai"). This arrogance will lead to their downfall. The remedy is to stop overthinking and surrender control to the Divine.