Do You Tip on Carry-Out Orders? [POLL]

I'm a pretty generous tipper. That may be why I often opt to get food to go instead of to dine in. I figure that the tip is for the waiter or waitress who brings the food to us, to help fill our drinks, to ask if we need anything else and to generally help us as needed. But, whenever you get food to go, there's still a place to leave a tip which I cross out (that way, nobody can write in their own tip) but what about you? Do you tip on carry out orders?