Reddit is full of
On Reddit you have to watch for the birth of front page items. We will walk you through how they become popular. Here is one example the Dinosaur Head Furniture.
It begins with one photo which was put up by Reddit user (friends_with_llamas)
My two friends (who are dating) decided to get a place together. The girl and I left to buy some things for the bathroom and we came back to this…
One Reddit user with the top comment (Gimli666) posted
Of course a request to create an animated gif was another comment.
Later in the day Reddit user (isawablacktriangle) posted that exact animated image.
Titled: Ellie! Ellie! Look!
To summarize in the end. People feel they are part of the inside joke when they see the new animated gif. I remember the story from earlier before! To feel that connection lets you feel you are part of an inside joke or a community. Of course others may not know what is going on so they read the comments to get some context.