Venture Bros. Brock Color-Changing Mug Set of 2 Regular Brock or bloody Brock? This 11-ounce ceramic mug changes color! Featuring macho secret agent Brock Samson. Derived from Adult Swim's The Venture Bros. Hot and bothered. Regular Brock or bloody Brock? Add a hot beverage to this 11-ounce black ceramic mug derived from Adult Swim's The Venture Bros. and the blood disappears. The image of macho secret agent Brock Samson, knife in hand, magically changes color! As the mug cools off again, the image changes back to bloody Brock. The The Venture Bros. logo on the back of the mug also changes from red to white and back again. How cool is that? Student of the great Hunter Gathers, former member of the OSI, and current member of SPHINX - Brock Samson is one bad dude. Trained to fight sharks, kill bears, and bed superspy ladies from all over the planet, there's no better baby sitter in the world. Seriously, that's a big part of his job!