Here's how this one works: I name a topic, and you think of as many valid, well-known items within the topic as you can (but only 1 item per post). If you are the last one to name an item within a topic, you win that set (being 'the last one' means that nobody replies within 24 hours of you). The winner then picks a new topic and we start again (but I have to approve the win before you can start the new topic).
Here's the first one:
Daily Show Correspondants (past and present)
Go!
Here, I'll start you off with an example of a vaild responce:
Stephen Colbert