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No need to be a geologist to find wry suggestive humor on any of these gifts featuring transgression and regression, along with the scientific truism saying "Orogeny Leads To Transgression & Regression". In geology, transgressions can be caused either by the land sinking or the ocean basins filling with water (or decreasing in capacity). Regression occurs when the sea level falls relative to the land and exposes former sea bottom. Transgressions and regressions may be caused by tectonic events such as orogenies, severe climate change such as ice ages, or isostatic adjustments following removal of ice or sediment load. Make others do a double-take with a dose of educational, geological attitude on the words "transgressions" and "regressions"! Memorable gifts for anyone into plate tectonics or orogeny (mountain-building)!