Lost SpongeBob Closing Logo

I'm thinking this is something that doesn't actually exist, then.

I don’t think there’s quite enough evidence to officially say it’s non-existent. Someone here claimed to remember it, so that’s at least something.

But while I’m still not 100% convinced it’s fake, I agree that it seems pretty unlikely at this point.

Yes that was me, a lot of the unsourced claims on that site still survive because they were simply copied and pasted from the original site when they moved it so there’s a lot of little bits here and there that haven’t been updated or fixed.

That’s great to know!

After I watched the LSSQ video which brought up this whole search, I did a bit of digging and it seems that I've found a weird gray area for the audio that plays during the UPP logo that could be some sort of lead.

The only SpongeBob split screen credits I could find online from the timeframe previously stated was from an unknown date in 2001 (show below and here), and instead of the end credits theme or the ocean sounds playing, in this instance it played audio related to the promo that was attached.  In this case, it's the theme song for The Fairly OddParents.  Now, this got me thinking that maybe the foghorn audio came from an unrelated Nick promo of some kind which would have played over the split screen credits.  Obviously none of this can be confirmed for sure, but considering it fits directly within the speculated window of time, it's certainly an option to consider for future searching.  Maybe looking through some Nick promos from this time could wield the speculated sound?

Another thing to note: This was posted on the LMW Discord yesterday by user FritzAnimates:

"Regarding the United Plankton "foghorn" variant, a commenter on YouTube brought this up. I found the commercial compilation they were talking about (well, a similar one anyhow), and the Nickelodeon logo (at 0:28) does indeed have a foghorn.....ish sound effect. Evidently there were multiple versions. I don't know if this is what we're looking for, but it's a start I suppose. (link to commercial break)"
This gives credence to the idea that the foghorn audio may have not been apart of (or at least wasn't exclusive to) the UPP logo, and might have just been apart of the Nickelodeon logo they used in the early 2000s used on basically all of their animated programming (including SpongeBob), or even the audio being attached to the promo as I mentioned earlier.  Stuff like this could have easily been misconstrued over time through false memories when the rumors about this variant started, thus misattributing the foghorn audio to UPP.  SpongeBob is a show that makes use of the foghorn quite a bit (like with the famous alarm clock), so if anything was to be attributed through false memory, it would be them. 

Yeah, I actually researched it months ago and also noticed there were instances where the music from the ad that was playing just continued over the logo.