So what is the grossest thing you have accidentally eaten or put in your mouth

I picked up a bag of goldfish crackers that belonged to my brother with the intention of finishing off the last bit that was left, only to discover he had decided to clip his toenails and use the bag to collect the clippings. Chewing someone else's toenails is more even unpleasant than one would think.
I also picked up a coke can someone was using as a spit cup and took a giant swig. I still gag when i think about that.