What does Mark Ruffalo mean by "The final exit"?

"Avengers: Infinity War" opens May 4, a year before "Avengers 4," which was previously called "Infinity War Part 2." Several of the cast members have been interchanging the two movies, calling them both "Infinity War," since they were filmed back-to-back in Atlanta.

Principal filming is now complete on both movies, and we know "Avengers 4" is meant to shake up the Marvel Cinematic Universe. Many old school stars have ended their contracts -- including Chris Hemsworth as Thor, and maybe Mark Ruffalo as Bruce Banner/The Hulk.

Ruffalo doesn't quite say "I'm done," but he gets close in the caption to this photo, showing him in his motion-capture suit as the Hulk:

Saw this on Reddit. Hhaha. My last day on IW. The final exit.

A post shared by Mark Ruffalo (@markruffalo) on

He got fans worried that Hulk will die. He also got them confused about the hobo look.

Ruffalo's smile suggests he's just joking around, but everything in the background looks like a staged scene. Hobo Hulk is apparently happening, and fans are speculating about why. Some fans have compared Hulk walking away to the closing scenes from Bill Bixby's "Incredible Hulk" TV show, set to "The Lonely Man."

The Incredible Hulk TV Series Closing Shots Compleat (vim) from Coffee T. House on Vimeo.

If Ruffalo's Hulk does have a scene like that, it would be a fitting but bittersweet farewell for the character in the MCU.

"Avengers: Infinity War" opens in theaters on May 4, 2018. "Avengers 4" opens May 3, 2019,

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Avengers: Infinity War Movie Poster
Avengers: Infinity War
2018
In Theaters on May 4, 2018

Iron Man, Thor, the Hulk and the rest of the Avengers unite to battle their most powerful enemy yet --... Read More

Incredible Hulk TV Show Poster
Incredible Hulk
CBSTVPGMarch 10, 1978

A research scientist, who changes into a green man-monster when angered, searches for an antidote. Read More