Should you tip on to-go orders?

Or only when you've been served at a table or bar?

Personally, I've gotten into the habit of tipping a dollar just to cover myself from feeling like I've done the wrong thing, and occasionally sometimes skipping a tip even on to-go orders will net me more cold treatment if I return. I'd always thought "well, I'm just buying the food, not getting served so..."

And if you're in a country without tipped food service workers, your opinion still counts.
Yes, tip something at least even on to-go
No, tip when you've been served by a waitress/waiter
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Should you tip on to-go orders?
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