I am, by far away, the worst kind of shopper. I pick things up. I put them down. I walk away and repeat the process about 40 times. I wander up and down the aisles because I had no idea what I wanted before I walked in.

And that's fine, because cans of fruit and tins of instant coffee don't give a shit how many times I lift them off the shelf. But Amazon's grand vision for a supermarket does care.