If the Shoe Gives You Fits

When Ned's parents hear him talking about Newton, they assume this is a new imaginary friend, similar to one Ned had in his early childhood, a big talking red shoe named Shoe. They take Ned to see a child psychiatrist, but when they accidentally see Newton who has been going out and around in the form of a shoe since he found out about Shoe, and assume that Ned's imaginary friend is visible to them as well, they also go and see a psychiatrist. In the end, it turns out Shoe is real.