I have them and have NEVER been able to catch one crawling around or see any...they retreat very quickly. And, they do come out at night and they just hit me the other night, about 8 days before the full moon (when many worms become active). I've killed a lot of other bugs, but the pinworms are still around and probably living in the appendix. I tried the Noxzema trick on the bumm, but it doesn't stop them. One thing you should consider is that many parasites shield themselves with heavy metals in the body, e.g. lead, tin, mercury, etc. If you have a high heavy metal toxicity like myself you need to start chelating with chelating compounds e.g. DMSA, Alpha Lapoic Acic, and molybenum for starters. When much of the metals are removed from their skin (and your body) they become more vulnerable to zappers and herbs. This is why some pinworm infestations can be so difficult. Another thing to consider is if you have substantial Candida; this stuff can be quite thick and provide a biolayer which bugs use to protect themselves and hide behind.