Self-Referential Humor

"Ever notice how the more successful observational comics become, the more their jokes focus on flying and hotels?"
Randall Munroe, xkcd #785 in the Alt Text

Super Trope index of all tropes having to do with referencing the nature of one's own medium, style and the almighty fourth wall to make a laugh or two.

Insert joke about the Fourth Wall of the wiki here while I go about linking to tropes that don't exist, and adding examples to the Self-Demonstrating Article list.

Tropes involved:

Waldorf: TV Tropes breaks the Fourth Wall soooo much...
Statler: How much do they break it?
Waldorf: They break it so much they're now a wholly owned subsidiary of The Home Depot!
Both: Ho Ho Ho!

Alternative Title(s):

Self Referential Humour