Above is an 18th century "witch bottle," used to fend off evil spirits. Discovered at a construction site in the London borough of Greenwich, this example is particularly rare because it's still corked. Retired chemistry professor Dr. Alan Massey analyzed the bottle and its curious contents. From Fortean Times:
(The bottle) contained 12 bent iron nails (one of which pierced a small leather heart), eight brass pins, 10 adult fingernail pairings (sic) (not from a manual worker, but a person "of some social standing"), a quantity of hair and urine with traces of nicotine, indicating it had come from a smoker. There were also traces of sulphur, then known as brimstone, and what is thought to be navel fluff. The brimstone recalled the passage in Revelation where the beast and the false prophet were "cast alive into a lake of fire burning with brimstone".