graph
Explanation
The Joke
This comic is a self-referential graph joke. The X-axis is labeled "Percent of Graph Viewed" (from 0% to 100%), and the Y-axis is labeled "Your Belief That There Really Is Nothing More To This Graph Joke." As you scan the graph from left to right, the line rises steadily, representing your growing conviction that the joke is simply a flat, uneventful graph with no punchline. Just as the line plateaus near the top -- confirming your suspicion that there is nothing more to it -- there is a sudden dip near the end, annotated with "Jesus, really?" in red text, followed by the line dropping off at 100%.
The graph is a perfectly self-fulfilling prophecy: it describes your psychological experience of reading it in real time. You start skeptical, become increasingly sure nothing will happen, and then the annotation at the end proves there was something more after all -- which retroactively validates the graph's premise. The "Jesus, really?" annotation is both the punchline and a meta-commentary on the reader's reaction to discovering there was a punchline hiding in what seemed like a contentless joke.
The Humor
The humor is deeply meta and self-referential. The graph is simultaneously the joke and a description of the experience of reading the joke. Most graph jokes in SMBC and similar comics derive humor from unexpected data or labels, but this one derives humor from the reader's own shifting expectations while consuming the comic. The small dip and annotation near the end are just enough to undermine the reader's settled belief that nothing would happen, creating a miniature emotional rollercoaster that the graph itself predicted. It is a comic that works precisely because it is about the experience of reading itself.