After the student delivered the pizza to old Ken's house, Ken asked,
"What is the usual tip?"

"Well," replied the youth, "this is my first trip here, but the other
guys say if I get 5 cents out of you, I'll be doing great."

"Is that so?" snorted Ken. "Well, just to show them how wrong they
are, here's five bucks."

"Thanks," replied the youth, "I'll put this towards my studies."

"What are you studying?" asked Ken.

The lad smiles and said: "Applied Psychology."