How come she said "he gets" while he's standing right in front of her? I think she could've said "look how nervous you get."
She says "gets" because of the use of the pronoun "he". In this scene, though Chandler is the one in front of her Janice is pointing out his nervousness to everyone in the room. She is talking about him, not to him. As she is using the pronoun he, in reference to Chandler, grammatically it has to be followed by "gets". If she were speaking directly to Chandler and using "you" then she would have to use "get". Ex: He gets so cranky when he's hungry. Ex: You get so cranky when you're hungry. Ex: She always gets everything she wants. Ex: You always get everything you want.