You've got to be kidding
Meaning/Usage: This is used when a true statement is ridiculous.
Explanation: Kidding is the same as joking. When a person hears something that is true, but it is not expected, the person will use this idiom to express that the statement is ridiculous.
A-Hey Jared. Mom told me to tell you that you shouldn't stay out too late.
B-You've got to be kidding me. I'm 30 years old.
Conversation
A-Patrick won the school election by two votes.
B-He's not that popular how did this happen?
A- Nobody voted because they expected Jason to win.
B- You've got to be kidding me.
Other Common Sentences
1-I really hope you're wrong.
2-Please tell me it ain't so.
image taken from googel 2017
