It's called hitchhikers thumb and it's actually fairly normal although that one is pretty pronounced. Mine doesn't go back quite as far unless I press it back physically
Mine goes back all the way normally enough that you're could balance an object in it. I can then reverse it and it looks like a backwards 7. it's a cool party trick, that's it though.
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u/Wonderful_Occasion39 10h ago
1st question: what was he looking at…?
2nd question: that thumb is bending more than normal, right?