[交流] Funny English quiz in everyday（NO.14）

Previously
Q: What will you see if you throw the butter out the window?

A: To see the butter fly~~(butterfly 蝴蝶)

Today’s Question
What always has one eye open but can't see?

We will hold this column everyday, the one who write the right answer first can earned 1 BB.
If u missed it this time, please come on and come here early, then use your smart head to find the answer.
I will give u the right answer in the column tomorrow.
So good luck to u!