While I was in Algeria, I was watching a cousin's toddler play with one of those toy computers that play a word when you press on a letter. The words, in this case, were in Arabic - Fusha (Classical), of course. Several times she repeated after the machine and then, with a very emphatic tone, added the Darja (Algerian dialect) translation - for example:
Machine: qird (monkey)
Toddler: qird! šadi!
Then she got to "bird" (Arabic ṭā'ir) and came out with the memorable line:
ṭā'ir! u b-əṛ-ṛumiyaa nqulu-lu ḷa ṭa'ir.
(ṭā'ir! And in French we call it ḷa ṭa'ir.)
Gets you wondering, really... how do kids acquire di/triglossia? It's certainly not just a matter of what they learn in school, as this case illustrates.