People are used to seeing "e;fake physics"e; in science fiction - concepts like faster-than-light travel, antigravity and time travel to name a few. The fiction label ought to be a giveaway, but some SF writers - especially those with a background in professional science - are so adept at "e;technobabble"e; that it can be difficult to work out what is fake and what is real. To confuse matters further, Isaac Asimov's 1948 piece about the fictitious time-travelling substance thiotimoline was written, not as a short story, but in the form of a spoof research paper. The boundaries between fact and fiction can also be blurred by physicists themselves - sometimes unintentionally, sometimes with tongue-in-cheek, sometimes to satirize perceived weaknesses in research practices. Examples range from hoaxes aimed at exposing poor editorial standards in academic publications, through "e;thought experiments"e; that sound like the plot of a sci-fi movie to April Fools' jokes. Even the latter may carry a serious message, whether about the sociology of science or poking fun at legitimate but far-out scientific hypotheses. This entertaining book is a joyous romp exploring the whole spectrum of fake physics - from science to fiction and back again.