Explain SMBC — the wiki for Saturday Morning Breakfast Cereal

This comic is simply a large banner reading "THANK YOU!" with smaller text underneath saying "CLICK TO SEE REASON FOR THE THANKYOU." This is a meta-comic, likely a placeholder or interstitial strip that Zach Weinersmith used to express gratitude to readers, possibly tied to a milestone (book launch, Kickstarter, etc.).

The humor, such as it is, lies in the self-referential nature: the comic is itself the reason for the thank-you, creating a playful loop. It may also be poking fun at clickbait culture by promising a "reason" that turns out to be nothing more than the thank-you itself. Without the clickable context of the original website (where clicking might reveal additional content or a votey panel), the strip functions as a sincere expression of gratitude wrapped in Weinersmith's characteristic self-aware, meta-comedic style.