The art of computer programming is not Donald Knuth's only art to master...
Actually vol. 4b of TAOCP has a (combinatorial) exercise about the possible configuration settings of DK's private organ; I think I saw it near page 300 or so.
They probably also shouldn't know about one other unless it's a poly situation. And then you need a career like a geologist on an oilrig or a submarine naval officer to explain those long absences.