Lists of 10

This started as an idea for interview questions to ask engineers that had nothing to do with engineering, to get a quick sense of how much a person reads and retains. In all of these questions the goal is to name 10 objects of the given type. In my formulation of the game naming at least 10 implies you can name 10 or more before guessing anything that is incorrect.

I like questions of this type because naming a couple of things is usually easy and it grows progressively more difficult to think of more, although there are usually 20 or more answers that will be recognizable if you see them. Many of these you feel like you should be able to name at least 10 if you're up on current affairs, such as heads of state or senators.