Meg was working her way through university by waitressing in a restaurant.
“What’s the usual tip?” asked a customer.
“Well,” said Meg, “this is my first day, but the other staff said that, if I got five dollars out of you, I’d be doing very well.”
“Is that so?” the customer said with a frown. “In that case, here’s twenty dollars.”
“Thanks, that’s very helpful when I’m working part-time and studying full-time,” Meg said.
“By the way, what are you studying?” asked the customer.