DiverBuoy once bubbled...
While the content of the hijack may be funny in and of itself, the effect on multiple things is negative:
- Serious thread is sidetracked
- Searches on content fail because the title and general content are mostly unrelated
- Visitors are confused and have more difficulty hunting down answers
- Isn't usually appreciated, especially by the originating member
- It is against the rules
- Usually gets moderated anyway (making more work for us)
That said humor has it's place, we certainly want this board to be a fun place to hang out, a little "on-topic" humor is an excellent way to lighten up a serious subject. To hijack and redirect a thread is inconsiderate at best.
[edited: Thread moved to Non-Diving]
Serious threads are rarely highjacked if they are, and it isn't a good thing (more on this in a minute) then they should be quickly moderated and returned to a the serious topic.
The exceptions to this are that sometimes the quickest way to stop a flame war is to creatively redirect the thread (I am guilty of trying to do this to various degrees of success.) or if the thread migrates on it's own to another topic that is indirectly related and relevant to the thread
If it is a humor thread to start with then IMNSHO they are fair game.