Panicking At The Tipping Point

I am the customer. I order a pizza online and get a “Pizza of the Day” deal for a $10 discount.

When the pizza is delivered, I notice I do not have my card with me. My mistake. I forgot how much the order was for, so I ask him to tell me the amount, and he just shows me the receipt.

I am in a hurry, so I notice the total amount ($41) before the deal discount, frantically try to search for some loonies since he does not have any spare change on him, and finally give him $46.

All this time he is smiling at me, and I am just thinking may be he is trying to be friendly.

Just now, the order email confirmation catches my eye, and I see that I paid an extra $15 for the pizza delivery and realize that probably that’s why the delivery guy was smiling, thinking he is getting a huge tip!