@Count Adramélekh Sear
Ah, I get it/remember now. Okay, here's the story:
The thread was borne out of an image and heated discussion of FlashLight (The Flash Sentry/Twilight Sparkle ship) that eventually got derailed into a general conversation thread. It went on and on and on, becoming known on the site as the "Eternal Thread".
Bumpy up there is indeed an original member of the original eternal thread, just like me, but he joined after I did.
As is the case with all image comment threads, there is a certain limit to the amount of comments that can be left before said thread is "capped", or discontinued.
We were lucky enough to go well beyond the original limit, possibly because the mods realized the significance of what was going on and were particularly amused by it.
Everyone eventually agreed that it had to be capped soon anyway, and so we all raced to see who would get the final, very last comment. The mod Zeb, who made semi-infrequent cameos on the Eternal Thread, left a comment with an image of Fluttershy saying "Goodbye", with him adding "see you all in the new thread", which had been already initiated by ItzJeff at that point. Thus, he included a link to this thread right here.
However, Bumpy left a comment right after Jeff saying almost the same thing: "Bye y'all. See ya in 2.0"
In the end, Bumpy got the very last comment, and Zeb declared a rather tongue-in-cheek "rivalry" with him, adding the tag "the image that started zeb's eternal feud with sirbumpaous".
Neither Bumpy nor Zeb had a hand at actually initiating the Eternal Thread, you see, but they are a big part of the lore of it!