I found them by setting the forum view to "The beginning" and sorting by first post (the column labels in the thread list). The posts listed have a last post of 38 years ago (I'm guessing the start of UNIX time - too lazy to calculate it).
They're probably harmless enough, but I thought it would be wise to bring them to the attention of our resident code ninjas in case they're part of a larger issue not yet discovered.
Posts
Dare I bump one of them?
so what you got was a "empty" thread that defaulted to the unix epoch, and for all intents and purposes you made the OP in that thread as a reply
edit: notice how your post is marked as #1