Jim Cramer, a prominent financial commentator, has advised investors to 'BUY the fear' associated with government shutdowns, drawing on his analysis of past shutdowns since Bill Clinton's presidency. Cramer emphasized that historically, markets have reacted positively during shutdown periods, referencing that the S&P 500 index increased by 10.3% during the longest shutdown under former President Trump from December 21, 2018, to January 25, 2019. He noted that the index has generally climbed through the last four shutdowns dating back to 1995, suggesting that investors should take advantage of market fears rather than retreating from them.