Talk of the devil...

General Cao Cao at his museum, Anyang, Henan

“Talk of the devil...” in Chinese is “talk of Cao Cao and there he is!” (说到曹操 曹操就到 Shuō dào Cáocāo Cáocāo jiù dào). Or, as in English, you leave off the second bit, just "Shuō dào Cáocāo ...”.

Cao Cao was a famous General in the tumultuous times of the Three Kingdoms of the Han Dynasty (202BC--200AD) and was known as being a fighter everywhere at once. 

Now he’s in Anyang, Henan, with his own museum. More photos here. The Museum is on the site of his mausoleum which was discovered in 2009.