an absolute sinecure

From Dirk Gently’s Holistic Detective Agency by Douglas Adams:

Indeed, it was not entirely clear if Reg had ever taught anybody at all and what, if anything, he would have taught them. His professorship was an obscure one, to say the least, and since he dispensed with his lecturing duties by the simple and time-honoured technique of presenting all his potential students with an exhaustive list of books that he knew for a fact had been out of print for thirty years, then flying into a tantrum if they failed to find them, no one had ever discovered the precise nature of his academic discipline. He had, of course, long ago taken the precaution of removing the only extant copies of the books on his reading list from the university and college libraries, as a result of which he had plenty of time to, well, to do whatever it was he did.

Since Richard had always managed to get on reasonably well with the old fruitcake, he had one day plucked up courage to ask him what, exactly, the Regius Professorship of Chronology was. It had been one of those light summery days when the world seems about to burst with pleasure at simply being itself, and Reg had been in an uncharacteristically forthcoming mood as they had walked over the bridge where the River Cam divided the older parts of the college from the newer.

“Sinecure, my dear fellow, an absolute sinecure,” he had beamed. “A small amount of money for a very small, or shall we say non-existent, amount of work. That puts me permanently just ahead of the game, whichis a comfortable if frugal place to spend your life. I recommend it.”