 The scene where Joel and Clementine watch the circus go through the  streets was made up on the spot, as the film crew and cast happened  to be working nearby and Michel Gondry (qv) decided it could work  well in the film. The part where Clementine disappears suddenly is  one of Gondrys favorite moments of the film, as Jim Carrey (qv)  didnt know Kate Winslet (qv) was going to disappear and Gondry  likes it because Carreys face appears so saddened. When the sound  blanks out in the final film, Carrey is actually saying "Kate?"