Buy a GSR biofeedback device (one with a tone, or even with lights if you want). Put a belt around your chest to simulate the pressure of the pneumatic tubes. Have someone ask you questions, and control the feedback the GSR gets.

You can sit there and pretend you're on fire. The tone will increase as you induce an adrenaline rush (kind of like that feeling you get just before falling asleep and you dream you're falling or tripping, as another example). Then relax and make the tone decrease. It's that easy.

On a control question, induce the adrenaline rush. On a relevant question, remain as calm as possible.