Riker: It is my understanding that one of the duties of the first officer on a Klingon vessel is to assassinate his captain.
Worf: Yes, sir.
Riker: Wouldn't that bring about chaos?
Worf: Of course not. When and if the captain becomes weak or unable to perform, it is expected that his honorable retirement should be assisted by his first. Your second officer will assassinate you for the same reasons.
Riker: This method of attrition could take a little getting used to.