Hi, I am wondering about the title of a movie that I only remember a little bit about.. it is driving me crazy... anyway, all I remember is a human boy who somehow turns cartoonish and ends up on a crazy rollercoaster and goes through the doldrums and meets different people... does anyone recognize this and can help? Thanks so much

The phantom tollbooth

Thank you so much! That is it exactly... wow you are fast. I really appreciate it!