when we took delivery of our then brand new boat, i was determined not to let a single stow away bug aboard. To that end, i insisted that everything coming aboard be removed from cardboard boxes or other secondary packaging. My wife sort of scoffed at the idea, so i told her a little story (fib) about how the international space station had become overrun by cockroaches because the russians failed to practice that same hygene. My young daughters were listening and that made an impression on them, at least.
As luck would have it, a few days later my wife was assisting with one of my daughter's field trips to the jet propulsion labs (jpl). While there, they viewed exhibits of the iss and received a little lecture about it, after which it was opened up to q&a. My wife asked, very innocently and sincerely, whether the cockroach problem had ever been resolved. The tour guy said he knew nothing about that, so my wife shared the details about the russian's being to blame due to their poor hygiene. The tour guy said that was the kind of thing that is generally kept quiet, but that he would try to find out.
When my wife told me the story, i fessed up. But, we have never seen either a silverfish or a roach on board. Hope i am not jinxing myself.