What are the worst things to accidently step on with barefeet?

I'm thinking Legos and this one time I stepped on a really big slug.

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Snake, I stepped on a small one but it wasn’t aggressive. I looked it up to find out what kind and it’s called a worm snake, the territory map was about one county east of here so they had migrated a bit. Also said they were not aggressive and usually just hang out in places where they can eat bugs.