There should be no need for anyone to "lay down ground rules", all anyone has to do is respond in a nice manner and choose carefully where to post unfunny remarks and silly pics. Why don't they start their own threads instead of spoiling those of others?

It's surely quite OK to post something funny or pics/animations where it's obviously relevant to what's going down on the thread but wading in with a derogatory remark aimed at a poster or pics etc which are again aimed at a poster only succeeds in either encoraging more of the same or puts off other posters.