Real men don't cry, but they can laugh from the heart. And the reason for such fun can be the most insignificant, for example a pedicure. They are not so much amused by cutting their nails as by scratching off rough skin. Looking at such sincere laughter, you involuntarily begin to laugh yourself.
If you believe that those who are afraid of tickling are jealous, then here is a selection of notorious jealous people.