Get real!

Idiom: "Get real!"

Definition:

to be serious or realistic about what's going on

Examples:

1) You think you can get into Harvard?  Get real!  Your grades aren’t good enough.

2) Get real!  You’ll never win the lottery.

中文解释： http://www.youzienglish.com/main/idiom_of_the_day/get_real/cn/