So hard to think of what to say to sidetrack the issue being addressed or cooling someone off. I try to act as friendly as possible but even then it's hard my voice gets shaky and I get nervous. And I zone out totally. Dissociate. I often dissociate or black out in situations of emotional crisis.
Its hard to come up with lies, or white lies when being yelled at too. You have to be able to stay cool, think of something believable and manage to build a good rapport with the guy interrogating you pretty much.
I find somehow it usually works out but phew how stressful it is!