I have a hen right now that likes to wait till I'm bent down petting teh other hens and she comes up from the side and takes a bit of my hair and eats it. She is sooooo weird. But you can't help but love her.
Once a chicken took a screw that fell out of my hands as I was working on building a coop and ran with it under the grapevines. I sure HOPE she didn't eat it. But there is a possibility.
Also, there was a blue tarp in the run once and a chick ate some of it. And couldn't swallow the whole thing since it was still attached to the rest of the tarp. So we had to cut it off as I couldn't pull it back out of her mouth. I was worried I had hurt her trying to pull it out.
No one seemed to have any future problems from these incidents.
This is gross, so stop here if you don't want to read.
My husband had a sinus infection and cleared his throat one day and spit and a chicken came running and ate it. I actually gagged a few times. It's hard to even write about it without my throat tightening.