How I Met Your Mother's Neil Patrick Harris is taking things back to his boy-genius Doogie days in this new commercial for Old Spice. In the ad, a white-coat-wearing NPH is an over-the-top "former make-believe doctor" on a mission to spread the word that chronic body odor can ruin lives. Take it from Doogie because, after all, he "used to play a doctor - for pretend."