The T-Files (Chapter 2)
Suddenly, she was discovered by one of the guards! He forced her to strip completely naked, then strapped her down on the table. He picked up the metal rods and said, "Since you seem to be curious about our gadgets, I'll give you a demonstration. This is called an Electro-Stimulus Unit or ESU. The human nervous system uses electrical impulses to inform the brain what's happening to the body. This device matches the frequency of those impulses to create a powerful tickling sensation. I can tickle you out of your mind just by just by stimulating the nerve endings on various parts of your body."