In the old days, hobos would communicate with each other using a secret language of codes and symbols that they would draw or etch on gate posts, walls, pavements or the like. These symbols would alert fellow hobos to things such as good places to sleep, generous householders, available work and so on, as well as warning of dangers such as unfriendly men, vicious dogs and other perils to be avoided. They say that the hobos had a symbol for pretty much everything, and any situation. One thing they never had a symbol for, however, was a crazed surgeon looking for victims to stitch together into a human centipede. With hindsight, we can now see that this was a disastrous omission.