Zz but No Zzz's

I should be sleeping but cannot. So I wonder why Conan didn't mention all his guests are double z.
  1. Aziz Ansari
    Master of None
  2. Lizzy Caplan
    Masters of Sex
  3. Billy Gibbons
    Master of ZZ Top
  4. Am I the only one who noticed the ZZ factor. Please let me sleep @ConanOBrien