It seems that most people lurk for a while before posting. But there is always something that makes someone cross that threshold and post for the first time. Some of them end up being legendary first posts (like the Grandma caught on CB during the Texas game), but most are more mundane than that.
Here is my first post:
https://www.cougarboard.com/board/message.html?id=2094198
Pretty standard "analysis". I love the request for feedback at the end ha ha.