The Mexican restaurant I frequent for lunch has on the menu one chicken taco for $1.69. It also has three chicken tacos for $4.69. I always get the three. But three is really more than I need and I always feel too full after lunch. And one is just not enough.
So here's what I did. I observed that there appears to be no rule against ordering two menu items. I ordered two tacos, the girl brought two tacos, I ate two tacos and I paid for two tacos. With the money I saved, I left a more generous tip than custom would dictate.
The world is a better place right now. And I feel fine.