Mark Ruffalo actually revealed the cliffhanger ending of a video of him burning it on social media in the hopes it would stop the film's producers panicking.

But Mark Ruffalo seems to be getting a bad reputation for spoilers, too. He accidentally (and hilariously) Thor: Ragnarok last year. Ruffalo took out his phone to capture the welcome reception, forgot to turn off the Instagram Live app, and gave his amused followers an unexpected treat.

It seems 2017 was a bad year for Ruffalo and spoilers. Back in July 2017, he got a bit carried away in one interview and let slip some major spoilers: in an interview with Good Morning America at D23, he told the interviewer unprompted that Avengers: Infinity War.

First up, Ruffalo was dangerously close to dropping major spoilers about the Half the universe dies." Ruffalo cut himself off partway, but not without giving up the big twist.

The gaffe was made more damaging - and amusing - by Cheadle's reaction. He didn't seem particularly happy with Ruffalo's discussion of Ragnarok in the first place - "I wouldn't say too much, he cautioned, "but hey, it's your movie" - but when Ruffalo veered on to Infinity War, the actor intervened far more strongly. "Dude," he interrupted, and the two actors traded an awkward glance: they both instinctively knew what had happened, leading to Ruffalo wondering how big a PR nightmare he'd created. Ruffalo keep glancing off-screen and begins to panic, but eventually, the interviewer managed to get things back on track.

To be fair to Ruffalo, this is the danger any actor faces on a high-profile film. On the one hand, the actor is under pressure to say something meaningful and newsworthy. They're also probably exhausted from months of filming; in Ruffalo's case, he was literally going from filming Avengers: Infinity War, to promoting Thor: Ragnarok, and then probably back to more filming for Avengers 4.

That this didn't get much traction despite being released on YouTube by GMA, and that those who did see it thought it was a practical joke by the actors, is no doubt a relief for Marvel.  is one of the most secretive films ever, so having its shocking ending known would have definitely hurt opening weekend.

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