This picture has been cracking me up ever since I saw it yesterday. Omaha didn't get it, and when I explained it she said, "Yeah, whatever." But I love it. I think the insights necessary to think, "It looks like he's breakdancing," make it a demotivational, come up with the way out-of-date "Stop! Hammertime," and then realize that not only would it be funnier in German, but that the viewer wouldn't even have to know German to get it, all point to a brilliant flash of insight.
This is another one that had me in loud giggles for quite a long time. To get it, you have to be a manga fiend
and know a bit about Japanese. As I put it when I first saw it, "I shouldn't laugh. I shouldn't even know why I shouldn't laugh. But god, that's funny."