Mr. Grübel, 61, broke into a broad smile when asked about the incident, which occurred at a "rally the troops" meeting of 900 Credit Suisse bankers in Orlando, Fla. The boss, it turns out, has a sense of humor. And if enduring a few taunts will help rebuild the morale at his bank's storm-tossed subsidiary, Credit Suisse First Boston, then Mr. Grübel is willing to do it. He and his chief lieutenant, Brady W. Dougan, are trying to sell their bankers on yet another turnaround plan after a turbulent four years in which Credit Suisse First Boston, once one of Wall Street's highest fliers, became perhaps its most dysfunctional major investment bank.