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I vaguely recall seeing the original 1971 film adaptation of Dahl's book, with Gene Wilder. But I barely remember any of it.
This film, however, has some show-stopping one-liners from the expression-filled, makeup-friendly face of Johnny Depp.
http://chocolatefactorymovie.warnerbros.com/
http://www.timburtoncollective.com/charlie.html
I don't want to spoil the film for anyone who hasn't seen it yet, but if you're familiar at all with Tim Burton's work you likely won't be disappointed.
It's dark, twisted fun.
And I'll never look at squirrels the same way again.