I always tip pizza/food people when delivered to my house.....if the weather is ****ty I'll tip more, because I didn't want to go out it the bad weather
Take out orders I don't normally tip, but again, one chinese place near home packages well, are very polite, and have NEVER screwed up an order so I always round up 2 bucks from the total....
Sit down places where we're served, the "tip scale" as I call it clicks down, or up depending on the effort..
One thing that really bugs me is at buffets or counter type places you get the evil eye when you pay and put down no tip, even though the servers do refills and make sure you're happy, for this I always make sure I've got cash......I won't pre-pay a tip......