Sentence:  If the French for pun, "calembour", derives (as Spitzer maintained) from "conundrum"; this points up well the at first puzzling effect of such devices. "Caran d'Ache" is in fact an intentional <WSD>hobson-jobson</WSD>. 
Meaning of the word marked with <WSD> tags:  A word or phrase borrowed by one language from another and modified in pronunciation to fit the set of sounds the borrowing language typically uses.