Mouse, having accidentally become intoxicated (through drinking water spiked with champagne), see pink elephants sing, dance, and play musical instruments during a hallucination sequence.
After the sequence, Dumbo and Timothy wake up, hungover, in a tree.
The song was written by Oliver Wallace (music) and Ned Washington (lyrics)[1] and sung by The Sportsmen.
The segment was directed by Norman Ferguson, laid out by Ken O'Connor and animated by Hicks Lokey, Karl Van Leuven, and Howard Swift.
[2] The song is featured in the Disney live-action remake, directed by Tim Burton.