 The scene at Medieval Times where Chip Douglas (Jim Carrey (qv))  asks for Stevens (Matthew Broderick (qv)) chicken skin and then  performs his _Silence of the Lambs (1991)_ (qv) impression was all  improvised. During one take, Carrey asked for the chicken skin out  of nowhere. After doing the "Silence of the Lambs" bit, director  Ben Stiller (qv) loved it and wanted to keep it in the film even  though it wasnt in the script. If you look at Matthew Brodericks  face during this scene, you can tell he is cracking up. His reaction  is a genuine laugh.