It is extremely intimidating. My interviewer decided that he was going to tear me apart and that he knew I was lying about something (I wasn't). He said he could only help me out if I admitted I was hiding something and told him why. I stuck to my guns, told him that I wasn't hiding anything, that I was sorry that it seemed like I was, and that I would be able to sleep soundly knowing I had been honest on my test, even if it appeared otherwise. He didn't like that a whole lot, but I told him I'd rather fail the process having told the truth than pass it having lied on it. Ended up leaving that job shortly after largely because I didn't want to do the polygraph. Fuck that noise.