Joaquin Phoenix's brief "engagement' on Letterman

NEW YORK (AP) - Chalk up another oddball appearance with David Letterman for actor Joaquin Phoenix, who announced his "engagement" on the CBS late-night host's talk show only to say hours later on Tuesday that it was a joke.

Before he came clean on "Good Morning America," news of Phoenix's supposed impending wedding to his yoga instructor spread widely on several legitimate news sources.

"I can get engaged again if you like," Phoenix told ABC's George Stephanopoulos after telling him he wasn't really ready to get hitched.

Phoenix's oddball appearance on Letterman's "Late Show" in February 2009, punctuated by several moments of uncomfortable silence, became one of late-night TV's first viral videos. Letterman memorably called that session to a close by saying, "I'm sorry you couldn't be here tonight."

By using Letterman's stage to announce a false engagement five years later, was Phoenix enacting a little revenge?

It was "just Joaquin's extraordinary and spontaneous sense of humor," said his spokesman, Susan Patricola.

During the "Late Show" on Monday, Phoenix got down on the stage to demonstrate "the harnessing of the hog," a supposed move his yoga instructor had taught him.

"This is the crazy part of the story," Phoenix said upon returning to Letterman's couch. "We started dating and I think she's the one. I proposed to her and she said yes."

Letterman seemed physically taken aback by the statement, pushing his chair back from his desk.

"You're getting married?" he said.

Yes, said Phoenix, if everything works out.

A few hours after Letterman's appearance had been taped, CBS' press representatives emailed a video clip with the subject line, "Joaquin Phoenix announces engagement on tonight's "Late Show with David Letterman' on CBS!" There was no indication it wasn't serious, and several news organizations, including ABC, Us Weekly and E! Entertainment, did stories.

Letterman said Tuesday: "Not engaged? Fine. Send back the slow-cooker."

Phoenix, who is making publicity rounds for a new movie, shot down the marriage story on "Good Morning America."

"I think, like, my life is so boring, it seemed like it was something exciting to talk about," he said. "I just want the audience to like me and they really like people who are getting married."

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