<p>A hilarious round-the-world tour of the state of our mother tongue, <i>The Mad World of Sign Language</i> is a collection of the most inappropriate, confusing, poorly translated and mind-bogglingly bizarre signs from every corner of the globe. English may be the one truly global language, but ubiquity is not without its pitfalls, especially when it comes to the art of signwriting. Whether garbled by online translators or run over rough-shod by Britons who really should know better, the language of Shakespeare is truly in a parlous condition. Thankfully the Telegraph is on hand to expose these misdemeanours to the cleansing power of ridicule, publishing the most egregious and amusing examples in the weekly feature Sign Language. Here, to aid in their valiant cause, we present the very best sightings from the year gone by.</p>