@clacke It does work sometimes.
Once Upon A Time the whole office was chasing a bug and getting nowhere. I gave up, went home (it was just a two minute walk) and had a bath.
On return to the office I went back to my desk and started working on something else. After a couple of minutes I looked up and said "you did solve that one, didn't you?"
No, they hadn't, they were still searching for it. "It's the line of code that says such-and-such," I said, having worked it out whilst in the bath and assuming, wrongly as it turned out, that my colleagues would also have found it.