One of the life's greatest pleasures is laughing out loud at what you read. There's such a disparity between apparent cause and effect. To innocent onlookers the reader is a useless lout, entranced by a static and quasi-meaningless page. The outburst of laughter, though, shatters their comfortable pretensions. What's going on over there? What's so funny?
A joke that requires explanation is no longer funny, of course, and trying to explain what made you laugh while reading is even less fruitful. So visit the Old Scout and see for yourself. Otherwise get back to work.