A College student was delivering pizza in order to supplement his income.
The grumpy customer said, “So you’ll probably expect a tip from me.”
“Well. The other delivery lads told me that I’d be lucky to get 25 cents from you.”
“Is that so? I’ll prove them wrong. Here’s five dollars.”
“Thanks Sir, I’ll put this into my study fund.”
“What are you studying?”
“Applied psychology.”