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I was out walking yesterday, and they had an infographic on birds on the trail. There were some bits of nuts on it so I brushed them off. I absentmindedly crushed one of them with my fingers and immediately a bunch of brown juice oozed out. I wiped it off but it already stained at that point. I figured I'd wash it off when I got home. The brown stain kept getting darker, and by the time I went to wash it off it wouldn't come out. Now it looks like I jammed 3 fingers up someone's asshole. Supposedly it takes like half a week to go away.
TLDNR: don't touch walnuts outer shells
