1. Tickling children
It has happened many times that adults have wanted to make children laugh and so they start ticking them. But a researcher from the University of California found out many years ago, that tickling doesn’t cause the same sensation of happiness as a funny joke does. It is only an illusion of happy laughter.
In this case, children laugh uncontrollably as the result of a reflex. Almost all people laugh when they are tickled. But the problem is, children laugh, even if they hate being tickled.