I've found the same thing. It's a good way of keeping kids thinking while having fun. Furthermore I think it builds confidence in their own way of thinking and a natural scepticism to new information. Is the world playing tricks with me again or is it valid information?
For example, with my very young niece, I would tell her nonsense stories, where there's a purple lion on the back of the turtle, etc. Keeping track of this weird story kept her gears spinning.
Other times I would tease her and say that my name was her name, or that blue was purple. I would try to mimic her voice, or draw out syllables in a funny way. The net result is hilarious conversations where she is explaining very carefully why I am not her, and why colors are different.
Basically, keeping things fun is useful for everyone, but even more for kids.