There are also restaurants in the US where the tip is optional or mandatory depending on the party size. If you and 2 other friends go to a restaurant, tipping

There are also restaurants in the US where the tip is optional or mandatory depending on the party size. If you and 2 other friends go to a restaurant, tipping is optional and you can decide the percentage. If you and 5 other friends go to a restaurant, tipping is mandatory and fixed at ~20%. And people wonder why I am asocial.