▶ Agreeing to an activity or plan
A: Matt, want to go for a swim again?
B: Yup. Count me in!
A: Scuba diving was great this morning.
B: Let's do it again sometime.
Dialogue
Paul: Wow! Tonight was awesome! Let's do this again sometime.
Mike: For sure. It's nice to meet outside in the summer.
Matt: Count me in!