I can bend my fingers as described, as well as my fingertips. I can bed my arms backward, though not quite as far. However, it freaks people the hell out when I do it, since it appears as though I have broken arms, or, as one person described it, “A Barbie doll with her arms on backwards.”
I can touch the floor with my hands by bending backwards. But I don’t make a habit of it.
Mine do bend, but only to a 45 degree angle at most.
this is kind of wierd but i can bend my pointer finger so far that it can touch the back of my hand without breaking it.
I know a surgeon whose hands are so flexible that it’s almost unsettling to watch him reach out to shake hands with someone. His whole hand just curls backwards, and he’s got huge hands. :eek:
Some people’s joints are just more flexible than others. I am more like your husband, OP, in that I am not very flexible at all. You know the “namaste” hand thing? I can’t bring my elbows up. I look more like a Christian praying than anything. As far as bending my fingers backward, even with using a desk or something for assistance, I am lucky to get 15 degrees of bend.
I can do all the things listed above. I am definitely double-jointed in my hands.
Also in my feet but I will leave that to your imagination…
I’ve always had more bendy fingers than anyone else. When I was much younger I could bend my thumbs down to touch my wrist forwards and backwards, but I have lost the flexibility to do that now. My fingers still bend and I can get a couple of inches between the tips without pushing them and more with a bit of pressure. My knees hyperextend, too.
I have double jointedness/hyper flexibility in a bunch of joints, though they get a bit less so the older I get (though I can tell that some of it is more because I don’t do it as much, and if I wanted to, I could get the muscles, tendons and ligaments warmed up again).
It’s fun to gross people out! 
I can:
[ul]
[li] bend my fingers backwards like others. [/li][li] “lock” my fingers so the tip is bent ~45° while the rest is super straight. You can see the two tendons pop out on top of the middle knuckle, which is really what grosses people out. I can even put a penny there and the tendons will hold it in place even upside down. :D[/li][li] Cross my middle finger over the index, ring finger over middle and pinkie over ring (though I have to place the fingers with the other hand). [/li][li] My thumbs can be bent backwards onto the back of the hand and stay there (I can’t find any pics on google! Maybe I should take one). [/li][li] Thumbs can also be bent to touch the forearm. [/li][li] If I hold my arms straightat, then cross them at the wrist before folding my hands together, I can rotate my folded-hands under towards my body and keep going (rotating just under 360°) until my arms are straightened again. [/li][li] My elbows and knees hyperextend. The elbows do so much that if I “straighten” both arms above my head, it forms a Y shape instead of two ||[/li][li] Both my shoulders and my hips can dislocate on command (or otherwise, heh heh). [/li][li] Oh, and the two toes next to the big toe (on each foot) can bend backwards at the top joint, too. [/li][/ul]
The dislocating shoulder bit is THE BEST to gross people out! They put their hand (lightly, no pushing down) onto the shoulder joint and I can either have it pop out by rotating a bent arm in the air or by putting my hand on a table and rotating that way. The face people make when they feel the arm suddenly pop/slide out (and back in) is :eek: x 1000.