Okay, anger. Anger is good. Howard's used to people being angry at him.

"Yeah, and do you understand just what 'no' means? I don't want to, and you don't want my first impression of this place to be sitting through something I'm scared of and don't want to do, alright? No. I'll do dinner but I'm not going to your movie, no matter how nice it is."

You'd think Stacy would realize he's awful for diplomatic missions at some point.