"Jealous Husband" joke

A jealous husband hired a private detective to check on the movements of
his wife. The husband wanted more than a written report; he wanted video
of his wife's activities.
A week later, the detective returned with a video. They sat down
together to watch it. Although the quality was less than professional,
the man saw his wife meeting another man! He saw the two of them
laughing in the park. He saw them enjoying themselves at an outdoor
cafe. He saw them dancing in a dimly lit nightclub. He saw the man and
his wife participate in a dozen activities with utter glee.
"I just can't believe this," the distraught husband said.
The detective said, "What's not to believe? It's right up there on the
screen!"
The husband replied, "I can't believe that my wife could be so much
fun!"