An old woman and a young girl stood by the seashore. The sea was raging, large waves leaping onto the sand and gobbling back into the water in a curl of cackles. The old woman shivered. The girl opened her arms and embraced the breeze.
"I want to go in!" said the girl.
"It is too cold," said the woman. 
"I don't mind. I want to go in!"
"You will get wet. You are not dressed for swimming."
"I will go naked if I must."
"No."
"I have to!"
"Why?"
The girl pondered it for some time. Then she ran straight into the water.
"Why!" yelled the old woman, clutching her arms on the shore.
"I don't know!" The girl plunged through the waves, laughing, shouting. Irresistibly, deliriously, happy.

The moral of the story: Don't question the why. Live in the moment.