Having allowed time for serious replies, I must tell a true story about one way to get rid of a silverfish.
I was sharing a cubicle with another grad student in zoology, and suddenly an insect scuttled across my desk. Insects not being my field I asked him "What's that?" He says, "It's a silverfish," and, lightning-fast, grabs a dictionary from his shelf, opens it to the page on "Silverfish," grabs it, drops it on the page and slams the dictionary closed, successfully mashing the silverfish into the dictionary right next to its definition.
Annual income twenty pounds, annual expenditure nineteen nineteen and six, result happiness; Annual income twenty pounds, annual expenditure twenty pounds ought and six, result misery.