Aggressively closing duplicate questions
I suppose the way most people get on meta is, that they notice something on StackOverflow that ticks them off. Then they want to vent their anger somewhere, and meta is the obvious place.
For example you see five veteran stackoverflowers close a newbie question because it's subjective. Then you log on to meta.stackoverflow, and post the following;
WE SHOULD BE MORE FRIENDLY TO NEWBIES GREETINGS METANEWBIE
What you're really after is crossing your debating skills with some other people, so you can see where you stand, whether other people agree, and just to vent some anger. However, the answer you get is:
CLOSED AS DUPLICATE WE DISCUSSED THIS DURING THE 2005 BETA FIVE GRUMPY META DEVELOPERS
This leaves you with the option of appending a 2005 post, which nobody will read. That's just a waste.
I think discussions can't be duplicated, because a 2005 discussion is really different from a 2009 discussion. Questions that have the "discussion" tag should not be closed as duplicate,
P.S. It would be pretty ironic if someone found a duplicate for this :)