Billy and Neil Patrick Harris play a round of "How I Met Your Mother: Lightning Round'' and "Racist or Vegetarian?''; Lindsay Lohan joins Billy for "How I Destroyed Your Mother.''
Debra Messing and Billy play "It's Debra Messing, You Gays!'' and "Smash or the Great Gatsby''; Christian Borle joins Billy for "Katherine McPhee or Nanny McPhee.''
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