DWAYNE Johnson is the nicest guy in Hollywood - until you get on his bad side.

It's a lesson recently learnt by Aussie comedian Ben Pobjie, who was roundly smacked down by the second-highest-paid actor in the world after throwing shade his way on Twitter.

It all started with a simple congratulatory message from Johnson to his wrestling buddy Kurt Angle, who was making his return to the WWE.

Pobjie, author of satire novel Aussie Aussie Aussie, quoted his tweet and responded: "Dwayne, wrestling isn't real. It's time you knew."

Considering Johnson has 12 million followers, it would have seemed a safe bet that he wasn't going to see it.

But he did.

The Baywatch star issued a sweet compliment to begin with, telling Pobjie he liked his "dry wit" - but quickly became brutal.

"Correct, I do in fact know wrestling isn't real. That's why I said 'have fun'. I also know, you can go f**k yourself."

Fans of Johnson loved the stoush, including Pobjie, who quickly responded.

The conversation wrapped up with Pobjie telling the star he is "a gentleman and an artist" and offering to send him a signed copy of his book - with Johnson graciously accepting.