This improv game is in the following improv game categories:
Ask everyone to change partners. Players are asked to look at each other lustfully.
Change partners again. Players are asked to look at each other joyfully.
Then yell any of the three emotions. Players need to find back the partner with which they did that emotion and do it again. Repeat this several times. Then ask players to walk around the room. When they meet one of their 3 partners, they return to the look that went with that partner. In between partners they stay neutral.
You can try more or different emotions, of course.