After the college boy delivered the pizza to Rodney and
Cathy's house, Rodney asked, "What is the usual tip?"

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

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

"Thanks," replied the youth, "I'll put this in my school
fund."

"What are you studying?" asked Rodney.

The lad smiled and said, "Applied psychology."