Taming inattentive students in the class

Write Dialogues for Taming inattentive students.

CASE
You are taking a class. A student is looking out of the window and seems pretty distracted.
What would you say if you:
1. are angry
2. want to sound sarcastic
3. don't want the issue to blow up
4. give a small reminder
5. set a strict lesson in the class?