Help Me, I'm Sprouting A Second Elbow

And you thought writing about my holy socks was weird....

It's true, I think I'm growing a second elbow! Last week I was laying in bed and noticed that from my distorted point of view, my elbow was looking a little different.... pointier. That same day Mark and I were just chatting about the usual (living by the ocean and never going to work). Suddenly in a horrified voice he shouts, "Why do you have two elbows on the same arm?!" We spent the next several minutes examining my strange elbows and trying to figure out if his were similar, or if I was in fact experiencing some sort of growth.

I'm not sure if my arms have always been this way, or if each of us just happened to notice their peculiar boniness on the same day. We soon became bored of the topic and moved onto other things. Then the other night Mark started referring to my second pointy elbow as my pterodactyl arm. This was followed by dinosaur noises, and miniature claw hand/arm flapping.

Does everyone have two bumps by their elbow? Or am I actually sprouting a pterodactyl arm?