Goodbye is a parting phrase. It is a contraction of God be with ye (14 century English), It may also refer to:
https://en.wikipedia.org/wiki/Goodbye
Seasons Summer Autumn Goodbye Hello Hot Cold
Summer/Autumn
"As a professor of science, I assure you we did, in fact, evolve from filthy monkey-men."
Cya next year...
Seasons Summer Autumn Goodbye Hello Hot Cold
Summer/Autumn