Mel Brooks and Carl Reiner. The 2000 Year Old Man routine, which contained alot of improvisation and so changed each time they did it, is such a classic bit of team comedy. That album also had some other great routines, with Reiner being the straightman interviewer to Brooks's many characters. Remember the Peruvian coffee grower who can't help revealing himself as a nazi during the course of the interview? Also the interviews in the coffeehouse and Brooks's parody of a coffeehouse folksinger, with his song, Twenty-Two Men: "Twenty-two men fell down and hurt their knee. Twenty-two men fell down and hurt their knee. Twenty-two men fell down. Down to the ground. Twenty-two men fell down and hurt their knee." Brooks's voice and awful guitar playing made that song a riot to listen to.