There was a show of Yoshitomo Nara's work at MOCA Cleveland a few years ago, it was one of the most memorable shows I have seen there. This Japanese artist's imagery haunts you like a bad experience from your childhood. I felt compelled to buy this ash tray from the gift shop even though I have not smoked since high school. This Wikipedia page on Yoshitomo Nara provides some nice background. Not all his images are so biting. I think what I like about his work is that he captures the essence of modern childhood in both a personal and general way.