Check it out—

I can wiggle my scalp! Look, no hands! It's as though it's detached from my skull. It moves about half an inch, back and forth, independent of the rest of my head. It's really freaky.

Friends and family laugh. Sometimes they say, "Stop. I mean it. Why are you doing that again?" And when I wiggle it out in public, like if I'm on a sidewalk, waiting, pedestrians' eyes get big and they skirt around me to pass.

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Sort of related: Not everything about the scalp and skull is funny. It's not. Have you given blood (Please consider it!), and they ask if you've ever had a dura mater graft? Take it from me: Don't go home and google that.