Comment by 7402

In college I used to go out to eat from time to time with a group of friends to a midnight pancake house.

This was a very nerdy group! In our "culture," everyone wrote down on their paper placemat the exact cost of each item ordered, and at the end of the meal calculated the exact amount of tax plus the canonical 15% tip, and put the correct amount on the table, making change as necessary.

It was pretty fast and frictionless!