Primal Screen is a documentary about a person's childhood fear of ventriloquist dummies and dolls due to the uncanny valley. Primal Screen is a documentary about a person's childhood fear of ventriloquist dummies and dolls due to the uncanny valley. Primal Screen is a documentary about a person's childhood fear of ventriloquist dummies and dolls due to the uncanny valley. Primal Screen is a documentary about a person's childhood fear of ventriloquist dummies and dolls due to the uncanny valley.