Looks like Kingdom Hearts made a cameo in "The Big Bang Theory" as a Kingdom Hearts 358/2 Days ad in the last page of a Batman comic. I was skeptical about this since the image in question is nothing short of fuzzy.. but I made a quick research and it looks like it's true. After taking a closer look at the image, I can say myself that the fuzzy page seems to actually match Kingdom Hearts 358/2 days cover. Here's the image, judge yourself!