A gem from Peter Gordon’s Continental Divide: Heidegger, Cassirer, Davos:
. . . a twenty-two year old student named Ernst Benz. . . recalled many years afterward that, in the afternoon following one of Heidegger’s lectures, a handful of the guests decided to take in the local scenery by riding the cable car that ascended from the valley of Davosplatz to the high, snow-covered peak of the Jakobshorn. Pressed together in the cabin and swaying slightly as it rose were a number of professors and students, including both Cassirer and Carnap. Cassirer turned to his neighbor: “Herr Kollege,” he asked, “How would you express the content of today’s lecture by Herr Heidegger in the language of mathematical logic?” And Carnap responded: “Quite simple: Bi-ba-bum!” (p. 327)
Gordon focuses on Carnap’s sardonic reply, which he speculates might allude to Christian Morgenstern’s Heine-esque little Bim, Bam, Bum (I seem to recall Carnap using those syllables somewhere else — perhaps the 1932 psychology paper?), but it seems to me that Cassirer’s question is at least as mischievous as Carnap’s answer.