After a cracking snapping sound when trying to grab something at an awkward angle, I became suddenly unable to straighten one of my fingers at the last joint. So the last joint of the finger bends in about at a 45 degree angle, and wont return to straight. No particular pain unless I try to manipulate it.
Dear patient You have got mallet finger deformity which is acute flexion at distal interphalangeal joint and unable to extend it. This happens due to sudden hyper flexion at distal IP joint which leads to avulsion of extensor tendon from its base. I would advise X-ray of involved finger anteroposterior and lateral views to confirm diagnosis. You need to wear mallet finger splint for 3 weeks to allow tendon healing to its place. If this does not benefit you need to consult expert hand specialist and get yourself examined.  All the best.