What terms or phrases almost always indicate a scam?

I can only imagine a scammer sending an email trying to imitate Trump:

Dear soon to be millionare,

It's the President, the best President, I said how can we make America great again? And you know what they said? You won't believe what they said, what they said, they said Donald; Donald I believe in you. So I said lets call Americans, let's call them and give them $10 million, but the only way we can prove they're an American is for them to send $5000 to the Rich Citizen Government Fund. But we made it easy for them. We made it so easy for them, that they'll be surprised how easy it is. They can send it to us through Paypal, but they have to hurry. They have to hurry. They have to hurry because we can only make so many people rich, so they can only get their money if they send it to our Paypal in the next 20 minutes. Any longer and you'll miss out on this wonderful chance. This amazing chance. And you'll be forever poor, and your friend is going to be a millionaire and you're going to wish that you did it too. SAD!

Sincerely,

DONALD TRUMP

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