Never. Skip. Leg. Day.
In the hilarious photo, Ruffalo is shown standing in his gigantic Hulk motion capture suit. While his torso, chest and head are appropriately Hulk-sized, his legs have been left with simple motion capture tights.
Ruffalo has portrayed the Hulk in five Marvel Cinematic Universe films -- The Avengers, Avengers: Age of Ultron, Thor: Ragnarok, Avengers: Infinity War and Avengers: Endgame -- and had a brief cameo at the end of Iron Man 3. He took over the role from Edward Norton, who starred in the MCU Phase One film The Incredible Hulk. Norton was expected to continue with the role and star in Avengers, but left the MCU after various disputes with Marvel, paving the way for Ruffalo to step in.
The last time fans saw Ruffalo's Hulk, he was recovering from reversing Thanos' snap and saving the universe. Marvel had no Hulk-related news at its Hall H Comic-Con panel, so it is unclear what the future holds for Bruce Banner. However, Ruffalo signed a contract for six films -- not including cameos -- so expect to see the Hulk again real soon.