You have to be a paid member to use signatures or have GIF images in your avatar.
Upgrade to a lifetime member ($10) and you get the use of sigs, and many, many other features.
For the sig itself, I like it. It's simple yet interesting, and I like the size.
"You lack the requisite spine and testicular fortitude to study under me"
"You do not know the first note of the music that moves me."