Good parable and saying

An old Korean saying my roommate told me,

When you laugh, the world laughs with you. When you cry, you cry alone.

A good saying I read in a good book,

Once there was a scorpion who wanted to cross a stream. He asked the frog to take him across on his back. The frog said, "no. you will sting me and I will die." To which the scorpion replied, " if I sting you then I will drown. The frog saw the scorpion's reasoning and agreed to take him across.

Halfway across, the scorpion stung the frog, plunging his barb into the frog's back. With the frog's dying breath, he asked the scorpion, why? To which the scorpion relied, "it is my nature." Then the frog died and the scorpion soon drowned.