Thread Necromancy
Sometimes new QCDN users will bring up a really old thread. They usually do not realize that the thread is 6 months old, they were just excited to see their name in it and figured to reply.
Do not take any action. If you absolutely can not resist, then PM the one who resurrected the thread to let them know about their mistake. The mods or myself will usually spot resurrected threads quickly and lock the thread.
If you intentionally and repeatedly bring up old threads, then you will find yourself access restricted in no time.
Resurrecting old threads is annoying, often those who participated in the thread are not even around anymore. If you feel strongly about a subject that has been discussed a long time ago, then make a new thread about it, and perhaps reference the old one.