T-shirts (or other clothing) that change colour according to how hot the wearer's body is. Popular in the 1990s. Failed invention due to fundamentally silly idea. See also midget cream.
Marc's T-shirt was made of global hypercolour. Then he went to prison.
A Shackteau is a humble, weather-beaten, structurally questionable shelter located in a spectacular or highly coveted place—Wales, Jackson Hole, Sun Valley, Crested Butte, coastal Maine, the Alps—where the building itself may be worth almost nothing, but the dirt, view, access, and mythology make it absurdly valuable.
In use:
Shackteâu - We thought it was an abandoned shed until the realtor called it a rare alpine Shackteâu with unobstructed views and listed it for $2million.