One way to try to beat a polygraph machine (lie detector, for the layman) is to flex your anal sphincter muscles.  If you pucker your brown eye during the control questions you can throw off the consistency of the readings by creating blood pressure changes.  You should note, however, that now some lie detectors come equipped with a pressure sensitive seat that will detect these anal contractions.  At this point you have to beat the polygraph test and the pressure sensitive seat… you can no longer look to your butthole for support—  you’re on your own.

I hated researching this one.