Other obvious lessons Donald Trump might consider:
"Water is wet, bears poop in the woods, and Donald Trump isn't qualified to be President of the United States."
Stephen Colbert is stunned Trump is pretending he "fixed" birtherism. "No you didn't. I know, because I was alive, and I was on TV."
"But maybe I remember it one way, and Donald Trump is a liar."
"We were there! We remember! Your supporters remember! It's why they're voting for you!"