If you have a fair question, ask it.
If you have a fair comment, say it.
If you need to find something about which to start a thread you can always look in the morning news to find something about which to be amused, saddened, puzzled, shocked, disgusted or outraged.
If you don't have anything interesting to say, don't say it. Just lurk in the weeds and wait until inspiration strikes, like a brick through a plate glass window. Shattering!
