I ran across a new (at least to me) gimmick for switching on a flashlight today at a Zeller's (soon to be extinct chain to be replaced by Target). It was a 5 mm "angry blue white" LED AAA penlight but instead of a click switch, the packaging said to "Touch the carbon bars" - bridging a fingertip across two (evidently conductive) plastic strips on the top of the light switched it on, and removing turns it off.
Can anyone see the drawback? Yes, it relies on a conductive fingertip - it won't switch on if you're wearing gloves.
It was $10 and not as "ultrabright" as the packaging promised; though I thought it was an unusual control method, the novelty wasn't worth the money to me. The brand name was "ILINE" but I can't find anything on a quick Google search.