Let's say someone posts a thread named "3D objects in DirectX" and asks how he can make a cylinder. He gets an answer. Then, some years later someone else posts a reply asking, how he can make a cone. What would you say to him?
"Stop it, someone may be subscribed to this thread!"
"Stop bumping threads! You just want it to be the first thread on the list."
"Why do you ask the same thing?"
"This thread was about DirectX 9.0b, but you are probably using DirectX 9.0c"
"Cone has nothing to do with cylinder, although the title is 3D objects."