Visa interviews can be pretty daunting. But that is still no excuse to lie during your interview. The consequences of lying could be permanent ineligibility for a US visa or a permanent record, which will influence your subsequent attempts to apply for the visa. So, make sure all the documents that you produce are completely unadulterated and true. Also, whatever claims you make in the interview should be completely true and not a work of fiction. Consular Officers are highly trained in their jobs and have years of experience. They will analyze and judge the way you walk, sit, interact with people while in the queue, and even the tiniest of facial expression.