[dorf]

Sounds like to me more like a Zelig Condition:
Set in the 1920s and 1930s, the film focuses on Leonard Zelig, a nondescript man who has the ability to transform his appearance to that of the people who surround him. He is observed at a party by F. Scott Fitzgerald, who notices that while mingling with the guests, Zelig sings the praises of the affluent classes in a refined, snobbish accent, but while in the kitchen with the servants, he seethes with rage at the fat cats in a thick proletarian voice. He soon gains international fame as a "human chameleon".

If you'd seen the movie you would know.