In New York City, most every restaurant will do take out orders. I'm never sure what the etiquette is for tipping when my order is ready, especially when I pay with a credit card and there's the line for gratuity. I always tip something (it's a NYC thing), but never know what the proper percentage should be. If I'm picking up a pizza order or cheap asian, I usually just take my food and go. But at higher end places, the bill can be $30 or more per person. How do you handle it?