He let out a chuckle which is unusual as both of you are watching a movie. There's nothing funny in the movie so you're confused with the sudden behavior, but it looked like he read your mind so he slightly grinned and just kept his mouth shut. But you know that he's chuckling because of something that involves you. Really, this man.

He just took a chip and ate it, but he's still grinning like an idiot while you're left confused.