It's good to tip delivery people.
Maria has a pizza delivered to her house for dinner.
Maria wants to show appreciation to the delivery driver.
Maria thanks the driver and gives them an extra five dollars on top of the bill.
Maria verbally expresses her gratitude but does not give the driver a tip.
The driver is grateful to receive additional compensation for delivering the pizza.
The driver is annoyed that they didn't make any money off of the delivery.