It's a gif showing a scientist throwing book in a portal. You see in the window behind every time the dude throw a book inside the portal, the civilisation change ( better each time he throw a book). Then he take the bible under the table leg and throw it too. The civilisation loose all progress in the window after he throw the bible.
Searched for it for hours, can't find it.
Creepy 'Friend Inside Me' Memes, Inspired By A 'Deltarune' Rumor, Take Over 'X'