Ooops! THIS is getting monotonous! / Remaining Barks quote

[Daniel van Eijmeren]

I just goofed and send eight empty messages to this list.
My apologies if you didn't like them. 

To make this ninth email on-topic, I'll end with reminding you of 
the last remaining undiscovered Barks-quote.

--- Daniël

"THIS is getting monotonous!" (Donald Duck)

Hint: This story features a Gyro Gearloose invention. Gyro is 
mentioned, but does not appear in this story. At the end of the 
story, Gyro is mentioned again. About a deal, this time. 
New hint: The story refers to a dinner.