Heh I still have a lot of those frikkin' declension, etc. songs stuck in my head.
Imaginine singing O, S, T, MUS, TIS, NT to the tune of the Mickey Mouse song (M I C...K E Y...)
Or a, ae, ae, am, long a, ae a-r-um, is, as, is.... to Old Macdonald
And finally, sum, es, est, sumus, estis, sunt...don't remember the tune for that one, though