Jeremy Renner flipped his frequent co-star Elizabeth Olsen the double bird on live TV on Thursday night (10Aug17) after learning she'd poked fun at him for his grumpiness.
The Avengers star was promoting the pair's new movie Wind River on The Late Late Show in America when host James Corden played a clip from his Olsen chat the night before.
During her appearance, the actress joked about her co-star's miserable look, telling Corden, "You're just like, 'Can you stop looking so grumpy 'cos everything's fine. It's the morning, nothing bad has happened'."
She went on to suggest Renner looks like Internet sensation Grumpy Cat, prompting the TV host to post a side-by-side shot of the pouting pussy and his guest.
The picture led Renner to look directly into the camera and flip Corden the bird.
Ironically, Renner was seated next to actress Aubrey Plaza, who voiced Grumpy Cat in 2014 TV movie Grumpy Cat's Worst Christmas Ever.