reality plagiarising fiction writers. Because underwear toxin is bizarre to the point of "wait, was that from an Austin Powers movie?"
Not that bizarre really, friends and family often borrow coats/t-shirts etc from each other but not underwear.
True, though in my admittedly not overly large circles of friends, family, acquaintances, etc., those brief (and sometimes frustratingly and unexpectedly permanent) reassignments of property, applying nerve toxin to the item has been a consideration in remarkably few situations. Those instances usually turned out to be a false alarm with only dry cleaning required to calm everyone's, um, nerves.