He knows Tony's joking, and the Hulk likes his babbling, honest. Okay, sometimes he wants him to hush up for a second, but that's usually because he can't keep up, and he wants to keep up with him. And even if Tony's posturing wasn't amusing, him hitting the Hulk is just hilarious, and the Hulk grins wide, seconds away from laughing. He lets Tony have one hit, and he lets him issue the challenge. Then he raises his hand, puts one finger against Tony's shoulder, and pushes with enough force to hopefully send Tony back on his butt, but no more than that.

"Two out of three?"