Washington (CNN) The ever-growing book of weird handshakes involving President Donald Trump has a new chapter!

On Thursday in Brussels -- ahead of a NATO summit -- Trump and newly-elected French president Emmanuel Macron sat down for a talk and a handshake. And what a handshake it was!

Watch!

Here's how pool reporter Phillip Rucker of The Washington Post , who was in the room, described it:

"They shook hands for an extended period of time. Each president gripped the other's hand with considerable intensity, their knuckles turning white and their jaws clenching and faces tightening."