Over the last seven years Etgar Keret has had plenty of reasons to worry. His son, Lev, was born in the middle of a terrorist attack in Tel Aviv. His father became ill. And he has been constantly tormented by nightmarish visions of the Iranian president Ahmadinejad, anti-Semitic remarks both real and imagined, and, perhaps most worrisome of all, a dogged telemarketer who seems likely to chase him ...