Republican presidential candidate Donald Trump shakes hands with former presidential candidate Ben Carson as he receives his endorsement at the Mar-A-Lago Club in Palm Beach, Florida. (Joe Raedle/Getty Images)

The way this Republican primary has gone, it’s hard to be surprised by anything.

But a lot of eyebrows still went up Thursday when news broke that Ben Carson would endorse Donald Trump. Remember, Trump made a sport of insulting Carson in the earlier stages of the campaign. The most memorable example came Nov. 13, when Trump described Carson’s temper as “pathological” and compared him to a child molester, saying “there’s no cure for it.”

“Pathological, there’s no cure for that,” Trump told CNN.

Nonetheless, the two seemed to bury the hatchet by Friday morning, when Carson officially backed Trump during a news conference at a Mar-A-Lago Club. Trump’s attacks “didn’t bother me that much at the time. I fully expected it,” Carson said. “When that happened, he was fighting to catch up, and sometimes when people are frightened they say foolish things.”

Twitter was, of course, primed for jokes at Carson’s expense. Here are a selection:

And two important thoughts: