Back in the good old dark ages of my youth (the orange and green plaid 70s), there was a sign by the nearby lake that said "No Dumping." So my friend Steve and I took some poster board, painted an "H" the same size and style as the type on the sign, laminated it, and attached it to the sign with with Super Glue so it read "No Humping." This was quality craftsmanship, and unsuspecting passersby would never know without close examination that the sign had been cleverly altered. For most of the rest of the 20th Century, that sign remained in that state. In fact, it came down only a few years ago.
Now, on a nearby regulatory sign, someone has carved in crude letters, "No Fucking."
Mon dieu. Oh, but for the good old days of putting thought and care into your work.