Insanity doesn't mean spam, or randomness. Also:
3. Keep your replies related to the topic in hand
Just as we expect thread creators to have a general topic or directive line in their threads, we also expect posters to follow said topic. Avoid short one-word replies, posts consisting solely on images or posts such as "What did I just read", "What the fuck is this thread" or anything similar. Furthermore, don't post anything that isn't related with the topic in hand and don't derail threads.