Pizza Tip

After the college boy delivered the pizza to Bud's trailer house, Bud 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 Bud.

- 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 Bud.

The lad smiled and said:

- Applied psychology.