For the past 16 years, the man of one hat, one horn -- a trombone -- has found himself on the receiving end of Conan O'Brien's jokes as a member of the show's house band, the Max Weinberg 7. A call from high school friend and fellow musician Rick Gazda with "an offer you can't refuse" brought him from Schenectady, N.Y., to the Stone Pony rock club in Asbury Park.