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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I accidentally walked through some broken glass with my feet bare.Somehow I had not seen it.My friend told me and I had heard the glass crunch and break under my soles.My feet are very tough with thick hard skin.No injuries I just brushed off my soles with a hand and kept on walking.