He doesn’t know Hau from Lau (the precise signification of “Hau” and “Lau” is doubtful, some interpreting it as “Yes” and “No”, and others as “Urging” and “Stopping” a camel.)
-Arabic Proverbs, Sigmar Hillelson, Sudan Notes and Records, No.2, 1921
I learned how to make a camel go and stop from hearing Peter O’Toole say Hut! and Ikh! in 70 mm. But when KhairAllah crossed trails with a Darfuri Dabouka and its Khabīr couched his camel with a Shh!, I rethought everything I’d learned about talking out loud at the movies.