Post in post in post in post in...

[Sprig]

Take a screenshot of the post above you, then put in a new layer (add in a new character, text, etc.)
Bonus points if the posts react to the ones above them.

I'll do an example

 

[Sprig]

 

[Wynn Liaw]

 

[Koopa con Carne]

 

[Sprig]