Kevin Hart

Stand-up can take you in so many different places, man. So many doors can be opened up from stand-up comedy, and the first one that was opened up for me was acting. But you can go from acting to being a TV personality to being a radio personality to being a writer to being a producer, to just being a visionary, to voiceover work.

It's fun and super exciting to see how other people work, how other people write music, and how other people put things together. To me, it's an endless learning process, and I love doing it because everybody works so completely differently.

The thing about dancing - what it taught me all those years - is it gives you an amazing sense of discipline in forcing yourself to do things that you know are good for you but you don't really want to do.

Frankly, as much as I love to improvise, it hasn't been difficult to stick to the script on 'Mad Men.' The writing is so precise, and the story so carefully crafted, that I don't think there's room - or need - for ad libbing. I could never come up with dialogue as lovely as these writers do, anyway.