In his book, The Social Animal, David Brooks explores how humans are designed for community. In one section he describes the difference between our laughing in isolation and in groups.

Robert Provine of the University of Maryland has found that people are thirty times more likely to laugh when they are with other people than when they are alone. When people are in bonding situations, laughter flows. Surprisingly, people who are speaking are 46 percent more likely to laugh during conversations than people who are listening. And they're not exactly laughing at hilarious punch lines. Only 15 percent of the sentences that trigger laughter are funny in any way that is discernible. Instead, laughter seems to bubble up spontaneously amidst conversations when people feel themselves responding in parallel ways to the same emotionally positive circumstances.

Even the seemingly mundane parts of humanity, like laughter, show how we've been hardwired by God to love and enjoy relationships.