"Col. von Kruger" smokes a cigarette.
Ostensibly an invisible associate of KAOS Agent Ehrlich introduced to Maxwell Smart after Max is captured and taken to Ehrlich's headquarters.
In fact, von Kruger's movements are controlled by a KAOS agent in another room through a system of wires and pulleys as part of an elaborate extortion attempt.
[Episode #5: "Now You See Him, Now You Don't"].