This image came up in the Facebook ads on my page. Something to do with replacement knees.
I thought, 'Yes, I must need a replacement: that's what my knobbly old knee looks like - the one on the left - as you look at it.' But then I thought, 'Actually the one on the right looks swollen and worse.'
Which suggests to me that the makers of this advert should rethink their image. I still don't know which one is supposed to be the perfect one. (And mine, though knobbly, are healthy joints.)