Can Rach guess her mystery guest today?! Spoiler alert – it's Neil Patrick Harris! And he's sitting down at the kitchen table to chat with Rach about his new children's book. Then, find out why one billionaire is going undercover in our audience. Plus, Dr. Ian Smith demystifies common medical mysteries. (What ARE hypnic jerks?) Meanwhile in the kitchen, Rach is cooking up Spanish-Style Chili!