Shilbottle
On the A1, just south of Alnwick in Northumberland, there's a village called Shilbottle. Since time immemorial, local kids have been adding a small horizontal bar to the first 'l' on the sign pointing towards it, so that the sign reads "Shitbottle".
A year or two back the comedian Stuart Lee used this as a barometer of how much timekids were spending on the Internet. In the past, whenever he passed that sign going to/from Edinburgh, he saw the defacement. However, in recent years, the presence of the added mark was less of a given. When you're a teenager with a smartphone, the Internet and a world of online pornography, adding some paint to a sign to make it look a bit rude suddenly doesn't seem so attractive.