I was High King of a land called Fillory. Instead of going to war with the neighboring kingdom, I challenged their king to a duel. Stupid, I know. Without magic I was severely outmatched. Margo thought singing before the duel would help put me in a better head space.
The second time I was being deposed of rule from said land and I was about to be executed: death my endless magical waterfall over many sharp rocks. But my friends needed my help which for some reason required us all to sing David Bowie, so I did. Thankfully the execution didn't work out.