You'll end up like a hamster on a never-ending wheel.
Some were kept in cages lit constantly, so as to resemble a never-ending overcast day.
You know what they say: you can chuck a man down a never-ending cavern, but you can never take away his dignity. Or something.
He's driven this way five times already, watching the same Banks and donut shops and car washes fly past in a never-ending reel.
Veteran actress Nancy Kwan (of Suzie Wong fame) narrates, but the never-ending narration makes it hard for viewers to breathe.
For reasons that are still unclear, one of the hunkiest actors alive decided to sport a never-ending goatee last winter.
You can vary this idiom quite a bit, and creative software designers are doing just that in the never-ending bid to cram more functions onto screens that are always too small.
Democracies foster a never-ending struggle between two rights: The government's obligation to protect national security; and the people's right to know, based on journalists' ability to access information.