I don't think we've seen him go completely off the rails.
Take his name calling and multiply it by a bunch.
Take his lies about opponents and multiply it by a bunch.
Take the worst of his idiotic tweets and multiply that by a bunch.
Then put him on national TV from the Oval Office.
Calling the Iranian's stupid, racist, derogatory names.
Saying they deserved to be slaughtered (decimated to the last man ).
Saying it was necessary for the US to stand up to them, when it was clear that the Iranians attacked him personally.
Saying anyone who didn't agree with him was a traitor. Saying that the Ds were allying with Iran against the US if they opposed him. Threatening to fire any general who didn't follow his orders.
Full on 'dictator mode'. Think about Hugo Chavez and some of his speeches.
The problem is that his supporters, which still are about 1/3 of the country, would lap it up.
They'd be all in to destroy 'those people'.
Like Trump, they don't think this sort of thing through.
Look how supportive they are for killing a representative of a foreign government on a diplomatic mission.
Look at how they are buying the fact that Suleimani was a 'top enemy' of the US, despite the fact that they never heard of him before (Trump has tweeted about him once in the past).
To repeat:
Scary as all hell.