This story about the "chubby" galaxy cluster Abell 1689 and dark matter made me laugh out loud. Here's the title:

Chubby Galaxy Cluster Suggests Dark Energy Was Stronger Long Ago

Then, later on in the story:
The new dark matter map reveals that Abell 1689 is denser at its center than physical models would predict.

"Abell 1689 appears to have been well fed at birth from the high density of dark matter surrounding it," Coe told SPACE.com. "This has given it a chubby belly which it has carried through its adult life to appear as we observe it today."
Awesome. So it isn't just Big Macs and beer, but also dark matter, that packs on the pounds. I wonder when we'll see the news stories: "NASA forced to pay obese scientist because he had to sample dark matter on a daily basis to ensure instrument accuracy remained high."

Beyond the fatty fat fat galaxy references, the rest of the story is interesting as well - check it out here.