KEY POINTS
  • CNBC's Jim Cramer flagged a seasonal traded from noted technician Larry Williams, who is forecasting a decline in the S&P 500 at the end of the month.
  • "If history is any guide, next week's gonna be ugly," Cramer said on "Mad Money."
  • "If you're a nimble trader, you might want to sell the S&P at the opening next Monday then swap back in near the end of the week," Cramer said.

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CNBC's Jim Cramer on Monday laid out a playbook for investors in the event the S&P 500 pulls back from its highs.

"If history is any guide, next week's gonna be ugly," he said.

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