Mark Ruffalo's kind of like a lovable pet dog with an unfortunate habit of shitting on the rug. You want to get mad at him, but he's just so damn sweet and likeable that you really can't. That's the situation Marvel Studios and the Russo Brothers are in, with the actor's reputation as a one-man spoiler machine causing big problems for their carefully laid marketing plans for Avengers 4. This led to the Infinity War directors jokingly sacking him via Twitter after he supposedly spoiled the title of the film on The Tonight Show Starring Jimmy Fallon.