A little body hack that could also earn you some $$$ as a sucker bet... If not, always a good laugh to do this with your friends.
The Fingerlock Sucker Bet - The funniest videos are a click away
The set up - part 1
Ask your victim to bring their two hands together, fingertip against fingertip, then get them to bend the middle fingers of each hand towards the palm.
The set up - part 2
Next place a coin between the tips of their ring fingers, and hold their ring fingers (and the coin) with your fingertips.
The challenge...
While keeping this position, ask them to successively separate the tips of their thumbs, index fingers, and pinkies...
They should manage this fairly easily.
The bet...
Now bet them they can't separate the tips of their ring fingers, enough to drop the coin...
If they still feel confident they can, let go of their ring fingers and watch them struggle... They will get the feeling their ring fingers are locked or glued together...
Why is it so? The muscles of the ring fingers are the least developped of all of the 5 digits. Our use of the ring finger is largely dependant on the two fingers on either side of it.
A few people do occaionally manage to separate their ring fingers however... to make the challenge harder for them, ask them to attempt it while holding a tennis ball between the palm of their hands
For a better "bet", tell them to hold a dollar bill between their palms while attempting to release the coin. If they can do it, they keep the dollar, but drop the dollar bill in the process, lose the bet.
Even though it is difficult, I do manage to release the coin. Might be due to practising the 'rasgueado' guitar technique, which trains independent finger muscle movement?
Cheers for the site :)