I've got off the 6:30 slow to Andheri, and I'm walking down the platform towards the exit. An old man is walking towards me, slowly shuffling. He has a bandage around his head, from which a clear, transparent tube emerges. It loops over his head and ends in a square of sticking plaster embedded on the side of his nose, leading back into his head. He seems to be directly inhaling his own cranial fluid.
I watch him shuffle past and get lost in the crowd. He doesn't look around, just keeps going, staring down at the ground.