depends on the situation, a coffee shop or takeout food it's not going to be a problem if you sit down in a restaurant and eat a $200+ dinner and don't tip, they might follow you to your car and ask you what was wrong with their service in hopes you'll be shamed into adding a tip but you are correct you're taking a chance if you pay before they package up the food for order-ahead places, anything can happen then the last oil change place i went to asked for a tip not going back there, needless to say
United States