Actor (and good sport!) Neil Patrick Harris helps Rachael with her new game, Audience Incognito! After sitting in the makeup chair and donning a disguise, he takes his seat with the rest of the audience. The star sits undetected until Rachael gives several clues to his identity, and a keen-eyed audience member recognizes him (and wins a trip to Mexico compliments of Funjet)!

Watch Neil's backstage transformation!

After losing his "fat suit" and slipping into something a little more comfortable, Neil tells Rachael how he was able to handle all the medical jargon when he played Doogie Howser, MD. "You get little sides every day of what you're going to say, so we would cut them out and place them inside the wounds. As you're saying, 'Hand me two CC's of so-and-so stat,' you're reading it right off the guts!"

In addition to starring as the famous teen doctor, Neil has appeared in several Broadway shows and can now be seen as Barney on the hit show How I Met Your Mother. But there's one role he's longing to play -- a judge on Iron Chef America. "I love the original, and Iron Chef America is fantastic. They're amazing chefs and to be a judge on that would be unbelievable because they cook the most amazing six-course meals. I don't know what kind of culinary expert I am, but I can wax poetic about the joys of gruel. I practice sometimes at other restaurants: 'Yes, I like the way that the two tastes combine together -- it really plays in my palate.'"

Though he may be humble about his culinary expertise, Neil is no stranger to the kitchen. He used to work at Schlotzky's sandwich shop and his parents own Perrenials Restaurant in Albuquerque, New Mexico. Neil shows off his cooking -- and juggling -- skills when he helps Rachael make a Grilled Meatball Caesar Salad.