On October 30, 1992, Cook and a group of local emerging improv/sketch comedians were scheduled to appear at the Boston Garden as part of local radio station WBCN's "Rock of Boston" music concert. Although they anticipated appearing earlier in the lineup, they were scheduled to perform between popular band Spin Doctors and the final headline act Phish, making them somewhat nervous but determined to do well. Moments after they took the stage however, the crowd, neither expecting nor appreciating a comedy act at this late stage in the evening's program and impatient for Phish to go on, expressed their displeasure by throwing their shoes at the stage. Robert Kelly, also on stage as a member of the comedy group, pleaded with the audience to settle down and let them perform their act; the crowd instead escalated to throwing lighters. Sustaining minor injuries, Cook and the comedy group left the stage. Cook described the incident – as well as how dejected he felt and his resulting determination to someday return to the Boston Garden and perform successfully someday – as part of a web series for The Tonight Show entitled "Worst I Ever Bombed".