Please help me I saw this movie long ago in HBO it was an animated movie about some kids going to a carnival... this carnival was hunted or something and the get trapped in it... the little girl holds a joker rag doll that comes to life... and at the end the siamese twins ask them a riddle of 2 guards in a prision with 2 exits one tells the truth and the other one always lie and if they solved the puzzle they will be home again... please help me it's driving me crazy because I thought the name of the movie was CARNIVAL but it is not... so please help me...

http://www.imdb.com/title/tt0091369/
I remember a scene like you describe in this movie. I hope this is it.

Try,.

Carnivale (99)

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Thank you very much is CARNIVALE I've been looking for this movie a lot!