The text for today's Questionable Content runs:

Today's strip is a loving homage (or blatant ripoff, depending on how you look at it) to Azumanga Daioh, which is probably my favorite manga/anime of all time, and has been a huge influence on QC. I recommend grabbing a copy of the omnibus and immersing yourself in it, even if you don't normally like them Japanese-type comic books.

... which is great, but try as I might, I am unable to understand how exactly Jeph imagined his fine work being a homage, let alone a "rip-off" of Azumanga. It sure looks like Marigold was thinking about some other cafe. Please refer to the following helpful illustration.

UPDATE: Ben e-mailed and DiGi mentioned on #animeblogger that Jeph probably wanted to refer to Sakaki's facepelm. But she famously facepalms about a different thing - namely Santa Chiyo-chihci, seen here parodied in the Nazi gag: