There is a pub in Newry, Co.Armagh, n.Ireland called The Brass Monkey and has a big picture of a brass coloured monkey on the outside.

Pretty unusual, but it just comes from the saying to describe cold weather, "it would freeze the b*l*s off a brass monkey".
A brass monkey was acutually the device used for holding cannon balls in times past and when it became really cold, the brass would contract and the cannon balls would fall off!!