If I'm not mistaken, threads are limited to 65,535 replies. (2^16 - 1)
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why do you guys keep banning me? (Zot! Because we can) (Juwish modz totally rewl!)
My guess is the record has to be held by either the Hobbit Hole or Freeple threads in "Chat". Nobody really knows what they talk about in there, but it looks like they've maxed out the limit dozens of times over. It's really pretty scarey when you stop to think about it.
That one was not the first to reach the limit, you know... only the first one to reach it only using spam. ;~D
The Hobbit Hole was first, followed closely (within a week) by one of the Neverending Story threads.