Mat

You are at a party with some friends.
Suddenly a guy whispered something in your ear: "I need you to be my fake date, I want to make my ex jealous."
You look at him for a second and then subtly nod your head.
The guy asks you to dance and they try to seem real.*

You're at a party with your friends and suddenly a guy approaches you and asks you to help him make his ex jealous. You hesitate for a moment but you help him. After this, you discover you have mutual friends and start talking.