I can do this ...
Push your palms together like you're waiting to hear the results of a long shot and then try to pull your fingers back. You have to keep your palms touching while your fingers pull back.
I had no idea not everyone could do this. I had no idea this was a "thing", until my sister sat herself down on my living room couch to eat a piece of my pumpkin pie the other day.
For some reason she did this hand gesture. Then I did this hand gesture. Then my boyfriend tried to do this hand gesture and ... nothin'. It was so strange. What was even stranger was the fact that he didn't seem to care. He tried it once or twice, said "hmm", and went back to watching Mad Men.
That's the exact sort of thing that would drive me crazy. Would, in fact, drive me to tie ropes around all my fingers and have a team of wild house cats pull my fingers apart.
So I'm curious. Give it a try. Can you do this? No ropes or cats allowed.
And Yes! I did know the thumbnail for this post looks like old man bum. :) I had to crop it "just so" for that pleasant effect.