Results: Do you tip when you pick up a To Go order?

When you eat at a restaurant, it is customary to tip. When you have food delivered, it is customary to tip. What do you do when you call a restaurant with a To Go order though? You drive to pick it up, and places like Outback Steakhouse will even bring it to your car. Other places have a drive-up window for convenience. Some still make you go in to get your food, and often these will have a Tip Jar on the counter. Are you supposed to tip when you go to pick up your food?? Even if you don't order food and pick it up, would you tip if you ever did?