What's the grossest thing your child has ever tracked into your house?

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We have outdoor cats, so you know the grossest thing that my little kid has tracked into the house would be cat droppings. It's a real mess to clean up too and is real stinky. But, with cats outside that's kind of common place. I try to keep her out of it, and always check the area where she is playing, but I suppose a little bit slips by even the most diligent mom. But, one of the oddest things that she has ever tracked into the house, and across my clean white stone tile floor was red lipstick! Now, I have no idea where she would get red lipstick or how it would get onto the bottom of her sandal. I am not sure if the lipstick was outside or in the laundry room and then she stepped onto it and tracked it out into the rest of the house. But, she did and it was a mess! A real mess and almost impossible to clean out of grout. Like I said, I have no idea where it came from! So, what's the strangest or grossest thing that your kid has ever picked up on their shoes and tracked through your house onto the carpet or floor? Gum? Tar? Mud? Did you clean it up? Or, did you make your kid clean up the mess?