 In 1981, Unruh pointed out that a direct analogue of Hawking radiation should occur in the most mundane and ordinary of physical systems, flowing water (under particular conditions). The physical basis for his idea is almost ridiculously simple: if water is flowing past a boundary more rapidly than its speed of sound, than an effective event horizon forms, for any disturbances in the water, which will propagate with the speed of sound, will necessarily be “trapped” behind the boundary. He then argued that the scattering of water wavelets at the boundary will occur with a thermalized spectrum, in exact accord with Hawking radiation (Unruh 1981, 2008). Since then, analogue models for Hawking radiation in a wide variety of fluid, solid-state, optical and quantum systems have been found. (See Barceló et al. 2011, Robertson 2012, Jacobson 2013, and Faccio et al. 2013 for recent reviews.) 