Ruffalo specifically names the Scarlet Witch as being able to bring out their dark sides.
"I love the new kids on the block. I love Wanda. She's able to bring out the worst in us," Ruffalo says.
This little statement make you wonder if the Scarlet Witch might be responsible for the Hulk's throw down with Iron Man that we saw some of in the first trailer.
Avengers: Age of Ultron opens in theaters May 1.