"What do you think??!!"
That - if you start thinking like the adults you're supposed to be - the penny's hopefully starting to drop, re. this 'Faith' & 'Belief' malarkey.
An 'Imagination' is one thing. Psychologists even suggest that 'Imaginary Friends' can actually be good for a child's developing self-realisation/awareness/personality, and how they relate to others & honing their interaction skills, thus their social development & growth. Becoming well-rounded individuals, and sane human beings as a whole, thus said psychologists tell parents to encourage such behaviour.
It doesn't look good to said parents, however, if they continue with that 'Invisible Friends' mentality. One word: Perception.
So your son was 'annoyed' about you not being able to see what he could? Does that sound familiar to you lot, re. we Atheists, and you banging on & on about 'Belief' and 'Faith'; the 'Spiritual Realm' and the 'Supernatural'?
PROTIP: I'm reminded of the scene in "Predator II", in the cemetery, and Lt. Harrigan (Danny Glover) is mourning over his dead comrade. The kid with the toy gun. He sees the Yautja, even though it has it's cloaking device activated. He then runs off to tell his parents...!
It's been said that fundie Christianity is 'Imaginary Friend(s)' for adults. What do you think, Ruptured Retards?! [/paradox] [/Argumentally Cornered]