Thread-jacks huh?
Actually, thread-jacks aren't foreign to me.
In this one community that I used to visit, many threads would be derailed almost immediately.
Fortunately, the derailment-struck area wasn't really a serious board/more casual and fun, so most people did it for laughs. And indeed, in most occations, it was quiet funny.
Hopefully the thread-jacks won't be too disruptive.