I have  a theory : Trump failed that cognitive test he's always boasting about all these years ago.

We know he's prone to talk about things that bother him but twists them to his own beliefs. and he hasn't stopped talking about passing that test since the day he took it.

My theory is this, he failed that test and couldn't believe it when they told him. He was so outraged that he couldn't even remember 5 easy words for a couple of minutes that he just dismissed the whole test and told them to never talk about it again.

but then they put tv camera's in front of him and he couldn't let it go so he boasted about passing it, and hasn't stopped since.