According to Tesco supermarket razorblades are stolen more than other products.
(In a report in the Guardian it seems that Tescos take a digital photo of you each time you pick up a Gillette razorblade from the store's shelf - it only takes one to prompt the camera - and again when you present the pack at the checkout. Tesco says that the photos are "temporarily stored", but does not specify for how long. However, Smart Labels Analyst magazine explains that this system enables the store to "blacklist certain shoppers and keep an eye on them". In his interview with the magazine, Alan Robinson recounts an occasion when his Cambridge store was able to show the police a photograph of a shoplifter in the act of removing two packets of razors from the shelf: "The police were completely flabbergasted, having never seen anything like it in their lives.")