When it comes to the Avengersfranchise,The Exotic Time Machine no potential clue is too small.

On Wednesday, the Russo Brothers -- who are currently hard at work on the follow-up to Avengers: Infinity War-- posted a tweet that was clearly designed to send fans into overdrive.

SEE ALSO: 'Avengers: Infinity War' bloopers may actually make owning a physical copy of the movie worth it

Here it is, in all its cryptic glory:

Okay, so that's a picture of Joe Russo -- one half of the directing due -- on the set of Avengers 4, busily typing away on his laptop. But is that allit is?

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The caption suggests not, and some fans were quick to highlight some potential clues.

There was also a fair bit of speculation that the photo might hint at the (as yet unreleased) title of the new movie.

The vast majority of the suggestions were far less serious, though.

Ultimately the Russo Brothers could tweet a picture of pretty much anything, and it would still occupy us for hours.

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