"When I see an elephant fly " has already been mentioned, but, also from Dumbo, there's "Pink Elephants on Parade", an amusing interlude when Dumbo is drunk.

Also, whilst on Disney, there's "Heffalumps and Woozels" (elephants & weasels ?) on one of the Winnie The Pooh videos.

What madness has of late possessed the brain ? Though few can write, yet fewer can refrain!