Dr. Oz goes undercover as a New York City cab driver to give passengers a pop-quiz on stress and a big surprise.

Click here to watch Part 2 and see the contestants face off in the studio.

Want to know how to look marvelous without splurging so much? Dr. Oz invites three beauty experts to share the smartest ways to save money while looking fabulous starting from your hair and makeup tools to the beauty products you use.