After the college student had delivered the pizza to Bud's trailer house, Bud asked what was the usual tip. "Well," replied the student, "this is my first trip here, but the other guys say if I get a quarter out of you, I will be doing great."
"Is that so?" snorted Bud. "Well, just to show them how wrong they are, here is five dollars."
"Thanks!" replied the student. "I will put this in my school fund."
"What are you studying?"