Foster's Home For Imaginary Friends - this sort of thing did actually happen in the official Foster's Home for Imaginary Friends comic series by DC

Such a world really would need a cut-off age for imaginary friends when hormones start kicking in. What would be worse, imaginary sex-doll or imaginary food? The sex-doll might at least be okay with everything.

But that scene with Terrance and the pizza still horrifies me to this day.

An actual official comic about a boy that creates a Bimbo Frankie as his imaginary friend.