You can see why I'm torn as well. When I go to a restaurant that makes me "go to the bar" to pick-up my order, I usually stand there for several minutes. It's the most awkward place to sit or stand, so I seldom will tip there, but if I see the person who's packing everything up in multiple containers, I'll usually tip them.
I think we'll cover this on this week's Life on the List, the Unauthorized Angie's List Podcast.
Who puts those "thin ice" signs out there?