Yep they do.
I was doing paperwork a while ago with my Piglet pen. Those of you that don't know, I'm a Piglet lover. My daughter in law gave me a Piglet pen, pink of course, with fur around the top and an adorable Piglet on a spring. Now it just doesn't get any better than a Piglet on a spring! I mean you move the pen and he bounces. But wait! My Piglet pen lights up when you write! Oh man oh man I'm in heaven!!! So, there I sat, springing my pig back and forth and laughing. I'd push the pen down to make him light up, then spring him about a bit more. He's probably got motion sickness now! This isn't a very good picture as it's hard to capture a springing Piglet with the camera in one hand while holding him with the other, but you'll get the drift. I'm off to my padded cell now...pink of course!