Make up something!

https://www.cnn.com/2018/04/29/health/brain-on-jazz-improvisation-improv/index.html

Not limited to Jazz or music improvisation - make up anything you want (why not pick a topic you enjoy?).  Make up new words to familiar songs (for the occasion).  Improv comedy -- don't be afraid of it.

from the article:

Fingers graze a keyboard, poised to play. A trumpet rises to the lips. Drumsticks perch in the air, ready to fall. The improv begins, and this combo of jazz musicians instantly creates a piece of music that has never been heard before.

As each instrument hijacks the melody, the song is reinvented in ways even the musician doesn't understand.

Revered jazz trumpeter Miles Davis put it this way: "I'll play it first and tell you what it is later."

For neuroscientist Dr. Charles Limb, jazz is pure creativity in action.

"When you hear great jazz, like John Coltrane or Miles Davis, it has this jaw-dropping quality to it, and what's been described as 'a sound of surprise' takes place," Limb said. "And you think to yourself, 'Wow, that's not just phenomenal music, that's phenomenal neurobiology.' "

Could jazz improvisation be a key to understanding how the brain invents? Could that creativity be studied? An accomplished jazz musician himself, Limb was the perfect scientist to tackle the project.