Husband and wife sit together in the kitchen and have breakfast.

Out of the blue she hits him with rolling pin.

After a few minutes conscious again he asks:”What was that ? – Why did you hit me that hard ?”

She: “That was for 25 years of bad s*x.

“He continues eating his breakfast thinking about this for a few minutes and than strikes back and knocks her out.

A few minutes later she is coming back to consciousness and he explains:

“That was because you know the difference between good and bad s*x.”