"OI! Canadians!" is the thread with the most replies, coming in at 164 replies.
Now with the flood control turned on at 15 seconds, we shouldn't have any problems where threads get spammed into oblivion. It takes at least 15 seconds to move to the next thread and type in a well-thought-out reply anyway, so it shouldn't be that noticeable.
We've had a couple threads die like this one, but never while it hasn't gotten any activity for a few hours. Perhaps a mod was deleting a few double posts or something? I'd venture to guess it had something to do with MySQL's relative instability when accessed frequently (it has no way of verifying transactions which is the main reason why MySQL claims the throne of speed king, but this also means that data can get corrupted very easily).
Technically, since the column type for the post ID # field is int(11), numbers of up to (10^11)-1 (99.9 billion) can be put in the post ID # field. If we were on a more stable database such as Sybase, I'll betcha a nickel it wouldn't miss a beat. The problem is, a Sybase server costs big bucks, and there are some features in MySQL that this board is using that can't be ported directly to Sybase.