I suspect I have something called "trigger finger," which makes it sound like, well, like I have a .45 in my belt and I'm itching to fire it.
But really, it's more like carpal tunnel for your finger. My finger gets stuck halfway between straight and bent, and if I continue bending it, the tendon snaps and causes all kinds of pain.
I am wearing a finger splint. Do you know how hard it is to type (or tie your shoes, or hold a mascara wand) with a finger that doesn't bend? I think I am now faster at texting with my thumbs than I am at typing with my fingers.