Do you know the name of this movie?

This sounds like the movie "Magic" starring Anthony Hopkins and Burgess Meredith.

I think that Robin (below me) is correct. Look at this description of the movie called Magic (1978):

http://www.imdb.com/title/tt0077889/maindetails

EDIT: IN FACT, HERE'S THE QUOTE FROM THE MOVIE SCRIPT:

Anthony Hopkins played Corky and the voice of Fats, the puppet.

Fats: Hey you know what I think?

Corky: What -do- you think?

Fats: We're gonna be a staaaaaaar!

I also believe you're thinking about tales from the crypt.

Don Rickles and Bobcat Goldwaith appeared in the episode. It was from the second season and the episode is called "The Ventriloquist's Dummy"

I only remember it because as a child that was the one episode that scared the crap out of me.

could have been an episope of "tales from the cript".

the guys puppet came to life and was trying to run the humans show.