Always remember those who serve you.

In the days, when an ice cream sundae cost much less, a 10 years
old boy entered a hotel coffee shop and sat at a table. A waitress put
a glass of water in front of him.
"How much is an ice cream sundae?" he asked.
"Fifty cents," replied the waitress.
The little boy pulled his hand out of his pocket and studied the coins
in it.
"Well, how much is a plain dish of ice cream?" he inquired.
By now more people were waiting for a table and the waitress was
growing impatient.
"Thirty-five cents," she brusquely replied.
The little boy again counted his coins.
"I'll have the plain ice cream," he said.
The waitress brought the ice cream, put the bill on the table and
walked away. The boy finished the ice cream, paid the cashier and
left. When the waitress came back, she began to cry as she wiped
down the table. There, placed neatly beside the empty dish, were two
nickels and five pennies.
You see he couldn't have the sundae, because he wanted enough left
to leave her a tip.