The Unigate Milk adverts featuring the mischievous “Humphreys” ran on British television in the 1970s and 1980s. The campaign showed invisible creatures called Humphreys sneaking into homes and offices to steal people’s milk, always leaving behind the warning, “Watch out, there’s a Humphrey about.” The ads became a major part of British pop culture and helped Unigate maintain its presence in a changing dairy market. The Humphreys were never shown on screen. Their presence was suggested only thro