I can do it with both hands, though I find it easier to do it with my left hand than with my right hand.
I can do it on both hands easily, without feeling any strain or tightness. Of course, it probably helps that I’ve been playing various stringed and keyboard instruments all my life, and also that I spend much of the day typing.
I can do it with both. Left hand’s a lot harder than the right, which is odd since I a) am left-handed and b) played the viola for a long time.
Yep – both hands.
Another pianist here, too…
Hmm, I type a lot. Maybe that is why I can do that finger thing easily.
I can do it easily on both hands… one at a time, both at a time, alternating… yeah, yeah, showing off. 
I also played piano and guitar for years.
If I bend them all the way down, the pinky comes up a little, but remains bent.
Right hand - yes
Left hand - not at all
On both hands my middle and ring fingers slant towards eachother slightly. (I’ve noticed that my mom’s fingers do this too.)
Suddenly I’m fascinated by my own fingers 
Both hands, no problem. However, on the right hand, I can bring it all the way back up above the plane of my hand with the pinky still bent, likely due to the fact that I broke that knuckle playing basketball in HS. It bends upwards at that point, and with my hand flat on the table, I can raise it not quite two inches off it without moving my other fingers.
I also played piano for many years.
I can do it with my right hand, but not my left. I fell down the stairs a few years ago and broke a bone in my right pinkie finger, and it’s never been quite the same since. Wonder if that is why?
Yes, I can do it on both hands, but with more strain in the pinky on my right hand. This could be because I played the 'cello from the age of 11 til 17, so my left hand is used to s-t-r-e-t-c-h-i-n-g along the fingerboard, while my right hand never has to stretch out. I’m right-handed.
That’s odd. I can do it on my left hand (I’m right handed), but not my right. Do do dooo dooo.
I can’t do it on either hand.
I can do it on both hands, but it’s a bit of a struggle on the right, which is odd since I’m right handed. Seems to be a common thing with people here.
My hand-talent is double jointed thumbs that can easily bend themselves through 180 degrees.
You and me both, baby, and we seem to be the odd ones out here!
Me too! But I can do them all easily. I can do this finger thing easy too. And I can bend my little fingers backwards to touch the back of my wrist and and my thumbs forward to touch my the front. Not, unfortunately, at the same time, but I’m going to work on it, although I’m not sure its physically possible. I’m a piano-playing, keyboard-addicted, funny-fingered freak.
I can do it with my right, but not left. I am right-handed.
I can do it no problem with my right hand but not very well with my left. (I am right handed).
Strangely, however, I can do the Vulcan salute thingy much easier with my left hand than my right. I wonder if there is some sort of inverse relationship there?
I can do it partially with my right hand, only a little with the left. Trying to just bend the pinkie by itself on the right hand gets it down to about 90 degrees. Any further than that and I either have to hold it down with my thumb or start bending the ring finger.
Just curous, for the people that can do it on the right, but not the left, are you all left handed? Just wondering, since I noticed that those of us who are right handed seem to be able to do it on the left, but not the right.