"What's the usual tip?" a man growled when Jason, a college boy, delivered his pizza.

"Well," Jason replied, "this is my first delivery, but the other guys said that if I got a quarter out of you, I'd be doing great."

"Is that so?" grunted the man. "In that case, here's two dollars."

"Thanks," Jason said. "I'll put it in my college fund."

"What are you studying?" inquired the man.

Jason replied, "Applied psychology."