Mark Ruffalo, Jimmy Fallon Test Their Friendship With Q&A Game

Andrew Lipovsky/NBC
Mark Ruffalo and Jimmy Fallon

Ruffalo's biggest fear: "drowning in milk."

Are Mark Ruffalo and Jimmy Fallon best friends?

The Now You See Me 2 actor and the Tonight Show host put their relationship to the test with a few questions about each other.

The two quizzed each other about their best qualities, biggest fears (drowning in milk?!) and favorite sandwiches, but couldn't find any common ground.

"I feel like I'm giving a Christmas gift to my wife," lamented Ruffalo. "It's just so hard to get it right."

Thankfully, they agreed on their favorite superhero: Ruffalo's Marvel character, the Hulk.

Ruffalo also laughed a ton about how awkward it was to lose the best supporting actor Oscar to a fellow actor with a very similar name.

Watch the videos below.