Questions that are “original” and personal, being strangely worded or having interesting ideas.
Questions that concerns about the latest or hot topics.
Controversial questions that are worded in a way that make an impression that the OPs have some prejudice (the effect may be doubled if the OPs are new)
Any kind of questions, as long as the OPs participate actively and try to dismiss everyone’s opinion in an arrogant/harsh way (again, it helps more if the OPs are new)
Any kind of questions, as long as at one point someone posts something and others disagree then an argument breaks out.
Some game threads.