If a joke generated a negative response from the audience, Carson/Carnac would cast a comedic curse upon them; occasoinally the curse would be directed at Ed McMahon if his introduction of Carnac's abilities became too over-the-top.
If a joke generated a negative response from the audience, Carson/Carnac would cast a comedic curse (e.g. "May a diseased yak squat in your hot tub") upon them. Occasionally the curse would be directed at Ed McMahon if his introduction of Carnac's abilities became too over-the-top.