Fake Google Ads?

Has anybody seen ads like this? These were in Gmail and, sure enough, they do go to example.com and cheese.com.

Searching around, I found someone else has noticed this as well. The text of the ads seem to be used by Google for various ad examples. But, I don’t see why they would be in the Adwords system as actual ads. Are they used by Google for testing somehow, are Adwords users creating them accidentally, or is it some clever click fraud scheme?

Regardless, a search for “Luxury Cruise to Mars” shows these ads appearing on a lot of sites (mostly “Coming Soon” sites). I’d be curious to know why these ads are out there.