“I’ve had a lot of fun. Good-bye, and thank you.”
The Life and Death of Émile Ajar (1980), an essay written prior to his suicide, as quoted in "Romain Gary: A Short Biography" by Madeleine Schwartz, at The Harvard Advocate http://www.theharvardadvocate.com/content/romain-gary-short-biography
Context: The gossip that came back to me from fashionable dinners where people pitied poor Romain Gary, who must be a little sad, a little jealous of the meteoric rise in the literary firmament of his cousin Emile Ajar… I’ve had a lot of fun. Good-bye, and thank you.