What's the weirdest/grossest thing you've found during a demo?

[Christen G.]

I'll start:
10+ lbs of cat food ... in the wall. (I broke the shopvac)

[Account Closed]

New rehab project, I was diagnosing an electric issue with a wire that ran through an attic near what had been a squirrel nest. I started removing insulation to get to the wire, and found what I thought was a stick and pulled it out. It turned out to be the tail of a mummified squirrel. I threw it into a trash bag and then found another dead mummified squirrel just under that one, and then another one under that one.  The bottom squirrel had been chewing on the wire and electrocuted itself.  I don't know how two more died above it, but what I did realize was that apparently the other squirrels had pushed the insulation back on top of the dead squirrel(s), until (apparently) they went hunting for that delicious electricity and died as well. 

It wasn't particularly gross since they had long since mummified in the hot dry attic, but it was really unsettling. 

Grossest was a foreclosed house that had been a dog hoarder house and was so bad that my throat would close up from the ammonia when I walked through it. It had to be gutted to the studs and parts of the subfloor replaced, and then the whole structure sodablasted and then sealed with shellac.