Dad replied by saying "Ignore that - I had made it up"
This completely baffled me. I was shocked beyond words. My thoughts were in a jumble. I mumbled "but that means... that means..." but was unable to finish. I finally said "I don't know what to think. I don't know what to believe and what not to."
Dad said "Don't take me so seriously. I've made loads of things up"
I told him that can't be possible. That too much of my world is based on things he's said, for me to pick apart things I know for myself and things I believe because he told me.
Dad reassured me he didn't make up stuff that was fundamentally important. And if he made something up it'd be trivial enough to be easily disproven if I throught about it carefully enough or did a bit of fact finding. And that I should treat things I think I know and things I think he told me with equal skepticism, because both of us may have made things up or believe things that aren't true.
And that's when I woke up.
I tried to remember what it was that we were discussing, what was the contradiction and what was the thing dad claimed he made up. But I simply couldn't remember any of it.