Are u Game?

Sketching with a pen is one of the things that I enjoy most. The best part about it is that you can't make mistakes. And the second best part is that you can do it anytime and anywhere - only thing you would need is a pen and some paper. I'm not into some particular pen, so I sketch with anything that I can lay my hand unto. Here is one of those. So, are you game for a sketch in pen?