Better than a raspberry!

I was a little confused too (plus it doesn’t help that the joke itself isn’t very clear) but I’ll boil down my own thinking:

• The Dunning Kruger effect is just that people bias towards thinking themselves more knowledgeable than they are when they lack expertise.
• The brain is probably human, and maybe healthy, if Google image search is to be believed. I’ve had anatomy classes with very dead brains to look at and brains certainly look like that (?) but plenty of primate brains look that way, too.
• I think OPs joke is that the second brain is the same, only measured differently because of said bias.
• It’s likely everyone in the comments have limited expertise and thus may be demonstrating said effect by correcting one another.

I’m still not getting the joke but I think it’s funny enough that us commenters of commenters are questioning things and might be the only ones not experiencing the Dunning Kruger effect. Lol