This paper offers a pragmatic account of two wh-questions in French used non-canonically - c’est quoi, ce N and qu’est-ce que constructions. It is claimed that in this non-canonical use, both constructions express surprise. As these constructions may be syntactically ambiguous between an information-seeking reading and a surprise reading, it is expected that the two readings differ in terms of prosody. This hypothesis is supported by the results of a production experiment. Experimental evidence shows significant prosodic differences between syntactically similar information-seeking questions and surprise questions. Surprise questions exhibit an increase in lengthening, slower speech rate and less frequent rising final contours.