Interviewing skills

Ever thought of this. I'm just back from a video recording of an interviewing session. Basically, I had to ( along with my colleague ) interview a fresher and a two years experienced candidate. Our HR video recorded the process for training the other senior people who should start recording now. The process was good and at times, we forgot that we are in a drama. We were dead serious in testing the poor candidates ( again our own colleagues ) skills. The same time, the situation changes when they start asking questions to you. Boy, its not easy to answer the basics after 10 years of industry experience.