英语笑话：English Joke - John Says I'm Pretty

A: John says I'm pretty. Andy says I'm ugly. What do you think, Peter?

B: I think you are pretty ugly.

Insulting someone is often considered funny, especially when that person is fishing for a complement¹.

NOTE: pretty ugly = very ugly

1 complement   

n.补足物，船上的定员；补语；vt.补充，补足

参考例句：

• The two suggestions complement each other.这两条建议相互补充。
• They oppose each other also complement each other.它们相辅相成。