One of my favourite mainstream media memes is what I call the "Raised hand" meme. It is typically used whenever someone steps outside the boundaries of establishment groupthink, particularly on immigration and related issues. The obvious intention is to draw a parallel with a Hitlerian Nazi salute.
Here is a "raised hand" image of Trump the Jews are using to illustrate an article at the Times of Israel.
The image above probably rates 6 out of 10 on the Hitler scale. The hand isn't quite flat enough and the arm not quite straight enough to for the full Fuhrer effect to kick in. Plus, Trump is smiling. Ideally, you want your raised hand image to have the subject scowling or looking angry. Bonus points if you can find one with their hair out of place.
Politico's stab at it is even weaker. Obviously struggling, they're forced to use an image of Trump pointing to hint at all things Nazi. 3/10
Here are some Marine Le Pen ones.
Maybe I'll add more examples to this page in future.