Extremely Wrong
When someone does or says something so wrong and stupid that there is no more effective put down than this.
Student: Steel doesn't rust.
Dr Pitt: You are claiming that steel does not rust. ಠ_ಠ
Student: Yes.
Dr Pitt: You are extremely wrong.
Dr Pitt: You are claiming that steel does not rust. ಠ_ಠ
Student: Yes.
Dr Pitt: You are extremely wrong.