Also: closely examine the tricks listed on RSCD Ridiculously Sensitive Charge Detector site. During humid conditions one can turn the LED on and off by scuffing a shoe on carpet ...but on a low-humidity day one can turn the LED on and off by slightly moving just one single toe.
Prepare to wiggle your toe, then proceed to ask yes/no questions of your activated S.S. (Capt Pike blinks twice for "No.") Show your audience that it lights up when you smirk at it, but refuses to light up no matter how intense others' gurning. Or, detect either high blood-alcohol levels or disguised aliens (where the light turns on as you wave it under certain noses but not others'.) All this under low humidity conditions, because if otherwise, your audience may notice your larger foot-movements against the carpet.
- author, amasci.com (See also hand-drawn holograms, $10 infrared goggles, others)