Couch potato

"My husband is a couch potato. He sits in front of the TV all day long."
"You have a huge belly because you're a couch potato. "
"I should be more active and less of a couch potato. "

A: "James. We're going to play basketball. Do you want to play?"
B: "No, I'm going to watch TV today."
A: "You did that all day yesterday. You better stop being a couch potato or you're going to get a big fat belly."

Other Common Sentences

"Good luck trying to get his attention. He's glued to the television."

Read one's mind

"You read my mind. "
"I was going to suggest that. You must have read my mind. "

A: "Do you want to go play pool?"
B: "You read my mind. That's exactly what I was thinking too."

Feel blue

"What a gloomy day. It makes me feel blue. "
"Whenever I feel blue, I like to listen to upbeat music."
"Matt's feeling a little blue right now. Let's go cheer him up."

A: "Where is Matt these days? I haven't seen him in a while."
B: "He feels a little blue because he can't find a girlfriend."
A: "Let's go cheer him up."

Other Common Sentences

"I feel a little depressed right now."
"I don't know why, but I just feel sad."
"Even though it's a nice day, I feel gloomy inside."