Mark Ruffalo posted this photo and caption on Instagram, causing a thousand Marvel fans to kvell: "@robertdowneyJr Bros." That's right: Science Bros in real life!
"Science Bros" refers to a meme celebrating the bromance between Bruce Banner (Ruffalo) and Tony Stark (Downey). There's a whole lot of fan art, some of it homoerotic, all of it made with love. Ruffalo only found out about it when a Vulture reporter mentioned it to him. "I endorse it 100 percent," he said. Google hard, though, and you'll never come out of it alive.