Today we introduce the first instalment of what we hope will be a semi-regular series where we ask: what did Donald Trump learn today?
The answer, of course, is to trust no-one - something it took being duped into tweeting a picture of serial killer couple Fred and Rose West rather than almost half a century working in the cutthroat world of business to understand.
Trump went from kindness to threats of litigation in just over three hours today after realising that a Twitter user’s request to tweet a picture to honour his dead parents’ memory was not as sweet or innocent as it seemed.
Here's 12.50pm (the below tweet has since been deleted):
But by 4.01pm:
As one Twitter user pointed it, you really can't trust anyone called "Feckhead" anymore.