Oh man did I ever lurk. I've been a lurking here since at the very latest the second Zero Punctuation video, I know for sure I was here before the third came out at least. And since then I've been back at least once a week for a new video, and then if I was bored I'd check out some other stuff and lurk the forums a bit.
So I had about 3 years worth of lurking, till fairly recently someone posted something quite idiotic and I felt compelled to create an account just to respond to it and throw some logic at the person's face (not that it worked obviously, but it made me feel better). Man there should be a badge for that kind of commitment to lurking.