Idiom:
Shoot yourself in the foot
Meaning:If you shoot yourself in the foot, you harm yourself in some way by doing something stupid or making a silly mistake.
给自己找麻烦；搬起石头砸自己脚

Example:

1. The Minister of Agriculture shot himself in the foot by saying that farmers couldn't understand economics because they weren't educated. He resigned soon after.

Quiz:
The head of the football association shot himself in the foot_____?
A. by telling a racist joke
B. by making some good decisions
C. by playing around with a gun

上期题目及答案：
Translate the following sentence into English.
我们中的大多数人都按自己的独特方式行事。

答案：Most of us follow the beat of our own different drummer