Mind the Gap. Wait for the green man. Caution:Â coffee is (not surprisingly!) hot. Donâ€™t use heavy machinery under the influence. The world is full of donâ€™ts, health and safety warnings and protection measuresÂ designedÂ to keep us safe, keep us healthy andÂ â€“ perhaps most importantly for those with the signs â€“ toÂ keep us from suing.