John Oliver announced he was "done" with Last Week Tonight after he achieved his "one and only goal" of having a "koala chlamydia ward" named after him.

The TV host's strange ambition was realised after actor Russell Crowe managed to "one-up" him by using the proceeds from his recent divorce auction - namely the $7,000 that Oliver paid for the jockstrap from Cinderella Man, which he donated it to the only surviving Blockbuster Video store in America.

Crowe, who was moved by the $7,000 donation from Oliver and the gesture to Blockbuster, then tweeted a specially created video of the Irwins unveiling The John Oliver Koala Chlamydia Ward at the famous zoo in Australia.

"Thank you so much to Russell Crowe for your amazing donation to help these koalas," the Irwins said. "And a big thank you to John Oliver... you are helping in the fight against chlamydia, and a plaque has been organised in your honour."

"Are you not entertained?" Oliver roared. "Back when this show started, I wrote down my one and only goal for it... a koala chlamydia ward. What I'm saying here is, we have accomplished everything we set out to do on this show, so we are f**king done here."

Oliver then proceeded to pack a box of things from his desk, including a golden, winged sneaker and a plastic fish. "My work here is done," he announced, and he exited the stage.

His departure was so earnest that many fans scrambled for some kind of sign that he would come back for more episodes.