In Germany, particularly in Hesse from what I've experienced, restaurant staff might take offense if you eat less than half of your meal and refuse to have the leftovers packed up. Just last week, a restaurant in Gießen went above and beyond by including an extra bowl of fruit salad alongside the remainder of our meal. That, I will remember a long time, especially after my wife's startling reaction to discovering a kiwi in the package – she's terrified of the fruit for some reason :)