Your teacher gives you the test results, and when you see them, you realize you got a 98. You smile and look at Troy

"I got a 98," you proudly say to Troy, but when you see Troy's expression, he looks sad. You feel happy because he appears sad, and then he slowly shows you his test result. You are shocked to see that he got 100, while you got annoyed because he once again got a higher score

Aww, I just got 100 he says, pretending to look sad. You know he's just teasing you.