Things to entertain hens?

[SWoRN]

I've heard of putting a swing for hens in the run, or in their yard. Who has a chicken swing?!?!? What other cool things to you have to keep your chickens entertained?

 

[BruceAZ]

 

[chickens really]

I have a swing in my run. Tree stumps are great. A bigger sized rock to hone their beaks.
I hung a shiny old CD by a string but mine soon tired of it.
Some like mirrors.
I toss in a bit of cabbage. container of garden dirt to peck at.
Whole pumpkin or squash with a hole cut in it so they can stick their heads in and clean it out.