When you gotta go, you gotta go, but there are ways to modify one's behavior
During the war my father worked on the development of RADAR. He was one of a number of RAF corporals who slept in a long hut with a pot-bellied boiler at the far end. There was a large steel sheet on the floor upon which was a smaller asbestos sheet carrying the boiler and a fire bucket.
Following an evening’s beery relaxation, all but one would go outside the hut and relieve themselves on the grass as bladder pressure built up. But there was one guy who insisted on relieving himself in the fire bucket.
Having access to some fairly substantial capacitors used to power the cavity magnetrons, the irked members of the hut connected a fully charged capacitor to the bucket and the metal plate.
The sudden crack of a discharging capacitor and the accompanying cry of pain at 02:00 hours signalled an end to the unpleasantness.
A friend did this to himself, back in the mid-late 1960's. At the time, he was living in the loft over a barn on some friends' ranch. Troubled with rodents, he built a trap powered by a rectified television (yeah, vacuum tube) power supply (~350 VDC) and some large electrolytics. One night, after much "beery relaxation", he went to relieve himself - in the wrong corner of the loft. Fortunately, the otherwise dry oak timbered floor didn't conduct enough to cause permanent harm...
Using various slices of the RF spectrum for sensing rather than communications has fascinating potential and some impressive implementations, but there are still many significant challenges, especially in the terahertz (sub-mm) band.
Using environmental energy to power remote sensor nodes remains a high interest item among system designers, especially those choosing wireless sensor node (WSN) components for remote and/or hazardous locations. At the Sensor Expo conference in Santa Clara, Calif., presenters at an energy harvesting and power symposium agreed that energy harvesting systems still require juggling many variables.