Why did the two of them "look at each other in astonishment and laugh unconsciously"

In the story "Seeing Ghosts", "The two looked at each other in astonishment and laughed unconsciously." Why?

Read it carefully and you will see that it is so. . .

On a rainy night, a man was walking alone with an umbrella. While walking, a person took shelter from the rain under the eaves and quietly got under the umbrella to walk with him. Along the way, I was speechless and suspected that it was a ghost. When we walked to the bridge, the man holding the umbrella pushed the person hiding from the rain into the water. The person who fell into the water also suspected that he was a ghost. The two suspected each other that the other was a ghost, panicked, and ran away. The next morning, the two met and looked at each other in shock. Was the "ghost" the other person? A sudden realization dawned on me. "Hahaha..." Then he laughed.

It turns out that they are too suspicious and suspicious. How can there be any ghosts in the world! Strings of laughter, full of sarcasm about superstition. If you don't believe in science and believe in gods and ghosts, you will make such a joke. This is telling people to believe in science and get rid of superstition!

Why the two of them "looked at each other in astonishment and laughed unconsciously"

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