Halloween jello mold?

I have a halloween mold that is for jello and it is a brain. I can not get it to come out of the mold. At first I could not get it hard I would try to get it out and it would be runny next year I tried again and I got harder and I got it out and then it just oozed all over the place. Then I got it hard it enough... show more I have a halloween mold that is for jello and it is a brain. I can not get it to come out of the mold. At first I could not get it hard I would try to get it out and it would be runny next year I tried again and I got harder and I got it out and then it just oozed all over the place. Then I got it hard it enough but it came out it pieces. I have sprayed it with cooking spray and it did not work. Can anyone give me tips on how to get it out? thanks alot.
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