What goes around, comes around. -- Paul Roth gave a spirited defence of a radical constructivism about historical knowledge in my department today: historical facts and events are created rather than discovered, and to speak of “what really happened” is just an out-dated form of bad metaphysics. The talk had a funny effect on me: it brought out the long-lost realist in my soul. We argued back and forth and into the pub. There I was suddenly struck by the irony of it all: thirty years ago Roth employed my very realist arguments against my beloved Sociology of Scientific Knowledge. Paul and I had a good laugh about it.