How do people carry glasses full of liquid without spilling them? It’s one of those perpetual mysteries, like how bikes stay upright, which I, personally, will always be baffled by. I’m currently sat in a pub, and there are people walking around carrying one, two, and three glasses of beer, keeping them perfectly level and not spilling a drop. I can’t help but reflect that that would be impossible for me: I have never picked up a full glass without spilling it, yet here people hold them level without even looking. I find it baffling, but I suppose it’s just one of those things I will never understand.